I've covered my RV for the past 3 years. I do it myself and, frankly, it's a little too heavy to act like a parachute in a mild breeze. Biggest problem: Didn't cover the gutter ends last year properly and they punctured the cover eventually - I got some caps that will prevent this for this year.
there's a video that shows the suggested installation method - it works and I can to it myself (ADCO All Climate + Wind Designer Tyvek RV Cover - Class A, 34' - 37' - ADCO 34826 - RV Covers - Camping World
) go down to the video titled "installation" and you can see what's involved.
And, yes, help is always wonderful, but not always possible. If you are not confident about being on the roof, maybe a cover is not for you. If you take your time, it works out okay. It is a bit of work, but not exhausting or anything.