I assume you can’t walk on your roof?
I saw a cool video where a guy, while using a step ladder, places his rolled up cover on the top front. By pulling a wound up rope, he unrolls the cover front to back. Then pulls the sides down. It worked really well for him.
For my TCer, I tie a rope around the back of my cover with it folded about 3’ wide. I get on the roof front & pull the cover up, then simply pull it to the back; then drop the sides down