first off, front or back, and is it a 2dr hatch or sedan? it should be 6 1/2 in the front, and same in the rear.
it's super easy regardless of placement. take off the plastic cover, in the front their a little harder to take off, but don't worry, it shouldn't break. I usually get a flat head screw driver and start at the back and pop it off. than it's like 3 or 4 screws. and with honda's they have a special clip that the wires run into, and than clip onto the speaker. you'll just have to cut those, than pull back the outside coating back an inch, your new speakers should come with new wires about 6" inches long. than you can just wrap those wires together and plug them right into the new speaker. I would say for 50 a pair, just go with some sony's. they've never done me wrong. and if the speaker doesn't get any sound out of it, that means you got the wires backwards. it really is easy, no need to pay a shop 65 bucks for them to take out 4 screws and put the new ones in.
good luck.
if you need more help, I can post some pictures for you. although since I already took off the stock clips, I won't be able to help you with that, but that's just as easy as cutting the wires.