Hey, how's it going??
I'll try to answer some of your questions...
1. Don't be stingy, if it looks dry then make it wet.... :D
2. As for grease, use white Lithium grease...
3. What's your question??
4. Paint thinner will work fine, but nothing too heavy duty because you don't want the plastic to melt..
5. From experience all those clear side-markers end up getting water inside then they tend to turn brown.. You may have to replace them often..
6. Now with bodykits, if you go with a good company you won't run into too many problems, if any at all.. I just put a very nice JDM kit on my car and it fit like a glove...
Good luck with your car and your future mods.. If you have any other questions feel free to shoot me a PM...