While I cannot offer you "local help", I think it is the secondary offset that confuses you as does many newbies. What it means is that the reflection of the spider and secondary mirror will not look centred once you are finished. Collimation instructions usually do not mention or illustrate this and can be very confusing. So if you follow the basic steps you'll be right:
1. Centre secondary under focuser (no need for super-high precision)
2. Adjust secondary tilt of secondary to bring primary to centre (X-hairs on centre spot).
3. Adjust primary tilt to bring Cheshire reflection to centre: coincident with primary centre spot.
Let me stress again: After you do this the reflection of spider + 2ndry mirror will not look centred. That is okay. That is how it is supposed to be. As long #1,2,3 are right, you are done.
See more detailed instructions from S&T here:
http://skytonight.com/howto/diy/3306876.html (which does mention 2ndry offset btw).