I know what your saying Christian but if it the car starts, idles, and drives already it's only really the ignition map, fuelling map, and boost control that your going to be playing with (unless it starts and idles really badly), which is pretty generic from the all be it limited number of mangement UI's i've seen, certainly on a simple 8v, single cam, CVH, it shouldnt be that hard?
I do think it's a good idea to see what your tuners prefered management is as you may get a better result using that, but I do also understand that there are some managements that tuners will not touch for various reasons, like MS where there is any possible number of DIY installer faults/problems that you might be up against before you even start