>>1214655Definitely get a bit of experience first - I've been riding and tinkering with bikes for 5 years and just a while ago did my first complete build from parts up. I've done most of the things before but there was stuff like installing the headset and press fit bottom bracket, cutting hydraulic brake hoses, setting tires up tubeless and such that was new to me and I had to get a few new tools in addition to the plenty I already had. Was able to do it otherwise all by myself but had to go to the LBS for help in getting one tire to mount when floor pump wasn't enough and installing the star nut in the steerer since I didn't have a vise and a big enough hammer.
Another thing when buying all the parts for assembling a bike is knowing which parts to get - there's a million different standards for bottom brackets, headsets, axles, brake attachments and such so you really need to do your research before buying so everything works together.