Not sure if you had a sedan, hatch, or coupe but here is the info you requested. Front door speakers measure 6.5" with a top depth of 1.75" (you
have no depth problems here but any larger than 1.75 and you might have
to cut out the factory housing.)
If they are door or kick panel speakers, you have to remove that panel
to extract the speakers. Then measure them with a ruler; better yet,
make a pencil outline of them (outside rim) and also where the mounting
holes are. Then, when you buy new speakers say at Best Buy or some
such, you will get the proper size, mounting and DEPTH. Unless you want
to build all new mounting enclosures, you have to be sure of all the
size measurements so that your new speakers will fit.
Wiring them is easy. There should be instructions. Speaker wires do
have a + and - side, and if you cross them, the speakers will work but
won't sound as good. Also be sure you have the POWER to drive your new
speakers. Buy speakers of the same "impedence", measured in ohms right
on your speakers.
Also, in here you can find the 1997 Honda Civic Service Manual
Easy job, good luck (remember rated this help).