Where are you located? You might be able to enlist some help from nearby snake lovers if you live in one of our more populated areas. (ie: If you're in Northern Virginia, I could probably help)
Speaking as someone who has moved entire household cross-country multiple times and done all the setting up by myself...I can tell you, where there's a will, there's a way!
First off...get to the hardware store and buy yourself a real tape measure. (Really, the hardware department of Wal Mart or some such would be fine!) You'll never be sorry you own it!
Second off...measure and re-measure the place that you want to put it. Make SURE that's where you want it and that it will fit BEFORE you go to the herculean effort of getting it up those stairs.
Third off...TRY to NOT take it apart, especially if you're not even sure how to make the drill work. IF that's your only solution...then, as I said, where there's a will, there's a way...and you can make it work. But it's very risky. Once taken apart and reassembled, it may not be as sturdy as it was before, and if you're not feeling confident in your handy-skills, you may not get it back together at all.
Lastly...consider your own strength and abilities. Are you fit enough to do some heavy lifting and shoving? If so, you can muscle that sucker up the stairs by yourself if you have to, but it will take patience...much care...and lots of tiny steps. I'm a 49 year old overweight woman of no particular physical fitness, but I could get it up the stairs if I needed to. If you think you could do it with the right know-how...let me know and I'll write out all the steps that I would take to make it happen.