I am the shrub and topiary specialist in this area. I love to do that kind of stuff just as much as I like raping TD's and talking crap. All for the ladies to say "my my that looks so nice, thank you for talking me out of cutting them down."
I just rehabbed one of the Arbs that was a little pom pom tree, very satisfying work. I know some people who see me think i am a common landscraper when I am working on them but I enjoy it very much.
What kind of tools? Just a few but make sure they are high quality and and sharp and make clean cuts.
Some Advise: If you are dealing with a shrub that someone just wants "pruned" and you both are unsure just trimm it like it was a small tree, raise it off the ground a little, clean out the dead, and thin it a little. It can take just as long as if it was a tree though so be prepared to invest the time to take your time to look at it as you go along. Most people don't care about what is above them, its what they walk by everday.
When I retire that's all i am going to do- shrubs, hedgerows and poodles. You know straping an a-frame ladder in the bed of a truck and driving down the line with a set of articulating, telescoping hedge shears is good work. Little secret to sucess there is to trim it, blow it out, trim it again, blow it again and then see how it looks. Pretty soon you will be doing bonzai.
Oh and: do you think I will still need the million dollar ins. policy for shrubs?