Take some time, create some test listings, check out a few tutorials, and like member_8880 said, post some specific problems so we can help you out better.
I'm quite computer savvy if I may say so myself, and I did not have a whole lot of trouble learning Auctiva. It's saved me so much money in fees though, I'd use it even if it was hard for me to use, which it isn't now that I've learned most of the tricks. Using profiles, seller details, etc I can create a listing in a matter of minutes if I have all the item specs ready.