i've never soldered a joint in my life before and i have just the high-school basic knowledge of electronics but i managed to successfully build 2 cores and 2 sid modules that work. i'd say it's really easy just precisely following the instructions. also - internet is your friend. any question regarding general electronics you'll have you can first try google (like - color codings for resistors, capacity codes for caps, soldering how-tos, ...) just do EXACTLY as it says on ucapps. i'm really careful&precise doing anything and i haven't had any problems. and there's this forum where kind people always answer all the questions to the people that show good will and self-initiative first.