special tool? bah humbug u wont need that. you can whack it if your plan is to replace it and not try and re-use it.
a good 3 jaw puller, little brains, and a few blips of the impact gun is all I've ever needed. only on a rare ocasion have i had to warm it up(canadian rust).
as for the size of the bolt? can't remember
do you do buy sockets and wrenches 1 by 1? it will be in your set