If your used to hacking phpbb, then you'll have no problem adding in hacks for vbulletin. There's no 'autohacker' but the instructions are very easy to follow in a 'find this / replace with this' kind of way. Even if your not familiar with php, its relatively simple and there's tons of help around here too if you should get stuck.
vb 3.0.x hacks wont work straight out of hte box with vb 3.5 due to some of the coding changes but hacks are being upgraded rather quickly. In the meantime, it would be best to run vb 3.0.7 until 3.5 is out of beta.
You'll enjoy vb alot.