I'd also add making sure you have the right paints as well. Some of them can be difficult to find the right type.
As an example, Slate Blue that's used on the Arena jetpack is not sold in stores, and has to be special ordered.
I had quite an issue going through Lowes as the manufacturer discontinued the product right after I bought it, so it was delayed in getting it.
As well I got me 5 more cans of this paint I don't need. At some point I figure I will post my extra cans here.
On the up side though, Hobby Lobby had a lot of good paint types like Rub 'n Buff that worked splendidly.