reminds me of putting a new gearbox in a mini I had, spent two days doing it only for the crank seal to **** oil on first start up, was gutted
Lesson to learn here is to read up on the tools and parts you will need. Your time is more valuable than a few gaskets etc. Now you know what a bitch stripped threads are, time to start cleaning / fixing threads and replacing bolts and nuts when you have stuff apart. You can make thread chasers from high grade bolts etc so needn't be costly and Screwfix metric bolts are cheap and OK for non critical stuff.
Lots of people on here have stuff they will help with, either parts or tools etc, a helicoil and first class stamp is nothing to most of us BUT the golden rule is to return tools, repay favours and heed advice. If you can pull a beetle motor on your own at 18 and not end up in A+E, you're on the right path