Not meaning to toot my own horn, but I've just gone through the process. I did the following:

1. read a TON and I mean a bunch, I wanted it as accurate as I can for now and it still is not there (cupola etc)
2. searched on here looked at what everyone else is doing done etc....
3. I also searched google for tips on applying.
4. found 2 books to be very helpful, both ordered on Amazon, Tiger1: on the western front Tiger1: on the eastern front, there are other good books as well. These are PACKED with photos on a per unit basis.

I've outlined how I did mine in the following thread, not the only way, maybe not even the best way but found it to work well.

http://www.rcuniverse.com/forum/m_5458727/tm.htm