Well, the question was "does anyone have experience in modding minecraft?", everything else is optional
I am using the custom modpack tool from the technic launcher (technicplatform.net).
I have assembled a modpack according to their guide, uploaded it in an acessible location (installing the pack works just fine), version is set to the target verion of the mods (1.7.2).
But when i want to play, the launcher checks the integrity of the packet (which is fine).
After the integrity check minecraft should start, but all that happens is that the launcher blinks out of existence (as it should when minecraft itself starts) and comes back almost instantly.
Without any minecraft window appearing.
No crash, no logfile, nothing.