VX Ignition Lock Cylinder

[IndyFetch]

The lock cylinder in my VX is starting to act up. It has always been a little finicky (will only turn with the key in one way; flip it over and it will not work), but it has recently taken a turn for the worse. Now it requires a lot of jiggling and baby talk before it will turn. My wife sprayed WD40 in it (I was not home), which did nothing other than coat the key in black liquid every time you remove it.

How difficult is it to replace the lock cylinder? I do not know much about working with electrical systems. I do not own a soldering iron. Should I even attempt it?

Also, my door locks have always had problems. You must pull the key out about 1/8 inch and sometimes jiggle it in order for the locks to operate. Should I get them all taken care of at the same time? (i.e. is it possible to get them all keyed the same so I do not have to use 2 keys?)

Thanks.