there is also available techniques to modify the handcontroller of the eq5 to allow autoguiding via st4 commands. See
http://www.store.shoestringastronomy.com/eq_mod.pdf
for the directions. Shoestring astronomy also sells a // port adapter to take the commands for guiding.
Hope this helps. Dont forget there are many people here to help so dont forget to ask any questions
Regards, Allan