Both front and rear seals on transmission leak and need replacing

That is alot of work. It would **** to have a mechanic paid to do this but unless you are pretty good with a wrench and have a hoist and such then it wouldnt be worth your time. Normally what is required for something like this is supporting the vehicle on jack stands and removing both front tires. Once front tires are removed you would then have to remove the axles which includes the brakes/rotors and what not. Once the axles where removed you would unbolt the transmission and remove it. Now the problem is if the engine is supported by a mount that bolts to the transmission you are going to have to support the motor with a hoist or jack until the transmission is installed. All in all it isnt really alot of work if you know what you are getting yourself into and have all the stuff you are going to need ie jacks/hoists/plenty of tools and a good weekend. Also remember all the small stuff that might need to be unbolted to clear the transmission

To replace the front seal, or "input seal" yes, you will have to remove the transmission, but not the engine. What do you mean by rear seal? The two side seals or "output seals" can be replaced in chassis however the axles will have to be removed. Seal replacement can be done with basic tools, seal removers are handy, but you can pry the old seals out with a screwdriver also (just be sure not to damage the transmission casing). You can use old sockets drive new seals in, just be sure to pack new seals with some grease to prevent the small spring on the inside from falling out during installation. If the input seal is really bad, remember that the leaking oil can soak the clutch, which isn't good and should be addressed sooner than later.