The bug-tech is the easiest shifter to fit, it really is just a case of bolting it in place as there is no shift plate to worry about.
You can fine tune things by winding the bottom ball adjuster up as high as you can making sure you get a good fit but thats it really. I'd advise you use their shift rod extensions, I have two on mine as this gives you a bit more throw.
I'm outside west London if you need any help or you want to try my setup.
Des