I, soldering newbie, have bought my first pedal kits from BYOC. The first one is the 250+ that is a replica of vintage DOD 250 and MXR Distortion+. First question, having never played any of those two, I don't know which one I wanna select (by changing the resistors you get either 250 or distortion+) ... I'm gonna practice soldering some random resistors onto a pcb board bought at radioshack, then, when I feel experienced, I'm gonna start the kit. Is there anything I need to do or avoid in order to not ruin this kit ? I have a 30watts iron and a 3rd hand. some 60/40 rosin core. Plus I've watched Terry Downs DVD about soldering. The only thing, I wasn't able to get flux anywhere, is it absolutely necessary ?