CV boots are a straight forward job with the right tools. I've got a daihatsu mira that needed the boots replaced and having never done it before was easy enough to do. The best way to do it is to just dismantle the cv's, the ones I had, had a small circlip locking the main bearing and cv itself in place. Just pop that out, remember where the ball bearings go then pop off the cv, pull the old boot off, slid the new one and don't forget to slide the boots ties on at this time too.... it's a pain the ass with everything greased to have to pull it apart... just saying.... ahahaha
Grease the cv with the boots on, then lock the boots in place, make sure you remeber what ridge they are supposed to be seated on as once they are tight its a pain to move them, again just saying...
once inner and outer ones are done, its a matter of lining everything up, going slowly to make sure you don't damage the splines that fit into the gearbox. There is a spring ring that is a pain to get in, just go slowly and just tap, tap tap it in and you will feel it seat. test rotation to make sure everything is seated and working correctly and the splines are lined up.
Assemble everything then repeat for the other side
Don't forget to top up the transmission fluid that will enevitably leak out when you pull the cv out, be prepared with an oil pan etc
supercheap have a fluid refill bottle with a hook hose and pump that works fantastically to top up the fluid with, wait till you have done both before filling too...
hope that helps.
The burnt plugs are easy enough to replace as mentioned if the wiring isn't damaged you pull the pins out, there is usually a flap that springs out and locks behind a plastic end, a small flat head screw driver is usually able to press that in enough to get the pins out. take a picture of the orientation before pulling them then any auto electrica store will have the replacement plugs.