Dont feel too bad, I was in your place not more than 2 years ago. Here is what Ive learned so far in my very narrow experience. If your going to be alone then its well worth the $80 or so dollars to get a deer cart. Wal Mart has a folding one that should do just right. If you bag a deer it will make the walk out MUCH better, because there is nothing harder to drag around than dead weight. As for field dressing, if youve had experience with cleaning birds then its not a gigantic step away. Just take your time, watch a video or two (cabelas has a great combo set on field dressing/skinning, and Home Butchering....another worthwhile undertaking if you want to try it.) Just remember that the lungs stick to the ribcage up near the backbone, so a few quick zips with the knife and everything should gently roll out. I also suggest that you hide the deer and remember or mark where it is if you need to leave it (say to go get your deer cart.) We all want to believe every sportsmen is honest.....but they are not. Too many stories of deer getting swiped or tagging them only to return to a tag and no deer. If you are hunting with a partner it gets easier because you can field dress while your buddy runs to the truck for the cart, or if you tree stand hunt throw your junk on the cart, pull it out, and strap it to the tree under you.
Hope this gives you a start.
Brian M.