1. just be careful, you'll get picked up more often by police with that kit, cwest/eastbear/bomexes are very catchy to popo eyes, after i used it myself, i won't recommend it to other people if you're using yours as daily often, >1k aud u will get taxed, if u can ask the seller to lower the value, that will be good, but u will get less value on ur insurance shipping
2. it's easy but u wud need a mate to do so, if you're doing it by urself its gonna takes long time, unless ur pros, paint cost 100-150 on budget sprayer or 300-500 on more elite sprayer (per bumper)
3.take it to auto paint shop, tell them the code or try to match it, then grab ur self the paint bucket, air spraygun buff polishes and sanding papers, and/or anything related
4. i personally dont care bout the kms but i check for its health, compression, etc etc...
cmiiw