not a lot, no... you just need to hit it harder, or more accurately perhaps. The pressure required is about the same as for a hammer-on, it's just getting used to it and bearing in mind you maybe don't have callouses on your picking hand finger tips... (?) Might mean you'r'e not gettinng as good a contact.

Tap high E 12th fret, off to pinky on fret 8, to index on 5, and just roll it around and around.... you'll get the idea. Distortion will help the taps come out, but you'll still have to get the volume even...