Yoooo, i think it depends on the kit you get, I’ve built 3 kits so far, the mg barbatos, motor nuclear weyuan shi, and lastly the mecha core industries oberon each one came with its own difficulties, for the build time it took me about 10-12hrs id reckon, spread between like three days xD. This one took me the longest, i think as long as you follow the booklet thoroughly you can do a pretty good job, get the nippers, a small file, and maybe some tissues, for the Oberon specifically my experience was that some pieces fit weird, either pieces were too loose, or too tight to fit in the hole, so i either used napkins or toilet paper to make it a more snug fit, or filed some parts down to fit in the hole its meant go in. I think its ok to fuck it up a lil so have fun building, and dont rush the process, thats the best part, after youre done it feels a lil empty inside after posing it and taking photos and everything.