Trying to choose a mobility scooter

Maybe some of you can commiserate. ;) I have arthritis in both my ankles and one of my knees. It's gotten to the point that (sometimes) I can't walk very far before something starts hurting.

So, I say to myself that maybe it's finally time for me to buy a mobility scooter. I do the usual checking of insurance and, as expected, realize that they're not gonna pay for that (since technically I can walk). I did a bunch more research on the internet about mobility scooters, etc. Anyway, at this point I'm completely confused about what kind to get. Unfortunately, even the "lightweight" mobility scooters tend to have a piece that's 20+ pounds, which is more than I could lift (I also have a bad back). So I'm probably going to have to get some kind of wheelchair lift for my car (I live by myself - also there isn't really public transportation where I live). But maybe not until I buy my next car, because my current one doesn't even have a hitch (which seems to be needed for an external lift.) So it's like, how do I figure out the right combination of these things without putting myself seriously in the hole money-wise?! Someone should write, "How to Choose a Mobility Scooter (and Accessories) For Dummies (tm)". Heh.