How can i really tell that my head gasket is really blown step by step

check running temperature,check oil filler cap to see if there is a creamy residue on the bottom of the cap indicates oil/water mixing same check of radiator cap,finally check oil dipstick if this shows contaminated oil this is a positive indication of head gasket failure, the rad/oil cap check may only indicate condensation reaction. HOPE THIS HELPS

Maybe an exhaust manifold gasket blown or worn out.

Well it would really depend on the condition of your engine.
It would take more labor to repair your engine than it would to just replace it. But unless the engine is very damaged it should be cheaper to have your engine fixed. And replacing the head gasket and having the head repaired should be under the price you were given. A head gasket set for a 4 cyl engine is around $100 wholesale.
I would call around and check with other shops next.

remove all the components necessary to remove the head from the engine block. the gasket that seals the head to the block is the one you want to replace. go to an autoparts store and get a manual that tells you step-by-step what to do and tools you will need.

There is really no difference between a blown or cracked head gasket. In either case the gasket would have to be replaced. Generally the term "cracked" is used when referring specifically to the cylinder head/s its/them selves. If the cylinder head is cracked it is a much more expensive repair.

a cracked head or blown head gasket,will cause your vehicle to have a miss in the cylander where the crack is or where the gasket is blown. you can also see coolant leaking if the gasket is blown. you can also see water in the oil,and white smoke come from the exhaust.
to tell for sure that the head is cracked,and not just a blown gasket is to remove the head. you will instantly see if the gasket is blown. if its not,then turn the head upside down and look at the small space between the valves,as this is where 99% of cracks occur.

I would suspect a bad radiator BEFORE jumping the gun on the head gasket, have a leakdown test performed by a mechanic before you buy anything this will tell you if indeed it is the head gasket, don't take his word for it have him perform the test, then and only then will you know what the problem really is before spending big bucks.

Often (but not always), a blown head gasket will also cause deposit of water on a piece of cardboard held an inch from the tailpipe output while the engine is running (when this is happening, it is likely that the catalytic converter has been ruined and the muffler will corrode in short order as well).

Sometimes drops of water will be seen dropping from the end of the tailpipe. Another clue: turn on the heater; often when the head gasket is blown an odor of antifreeze and synthetic rubber will emanate from the heater vents.
Many of the symptoms of blown head gasket can be caused by some other problem in the cooling system, without the head gasket being damaged. Conversely, other problems with the cooling system can cause a blown head gasket and/or warped head.

When checking for a blown head gasket, one of the most common tell-tale signs is a milky-gray ring around your oil cap. When coolant enters the engine oil through a crack in the head or through a blown gasket, it evaporates and leaves a milky ring around the oil cap. Another easy way to tell is to check your oil dipstick. Change your oil and pull out the dipstick. Make sure that you take note of how far up the dipstick the oil is. Top off your cooling system and fill your cooling reservoir to the top. Screw radiator cap back on and start engine. Run engine for about 20-30 mins. or until it reaches normal operating temperature. Allow engine to cool (engine must cool completely to get accurate oil reading!!). Check oil dipstick again. If the oil has a watery appearance and has risen noticeably up the dipstick, the you probably have a blown head gasket or a warped head. Also look for a dripping, sweet-smelling liquid coming out of your tailpipe. Any of the above symptoms could be the result of a blown head gasket. The easiest way to tell is with a compression meter. This replaces the spark plug and lets you know what compression each cylinder is running at. If your compression is abnormally low, then you have a blown head gasket or a warped head. (note: consult repair manual for appropriate compression of each cylinder.)

Here are the removal procedures for your vehicle's cylinder head. Gasket can be replaced once head is removed.

if you get a haynes repair manual and follow it step by step everything should go fine. or clintons. if you have questions about what its telling you to do then that would be a good thing to ask. the problem is there are alot of different designs for engines and it could be affected and it could not be. but if your not sure you definitly need a repair manual. it would tell you everything but it will guide you in the right direction