Installing Expandable Liner WITH a deck

Hello. Our liner came down on the edge and had a very low hole in it so after 15 years of use we decided to get a new liner. Got the expandable doughboy 20mil throughout liner, from a local dealer, like we used the first time...but the 1st time there was no deck around the pool yet. I have found a lot of info about installing an expandable liner but all of them say "now if there is a deck around the pool that is a different story" "let's assume you have complete access to the outside of the pool walls" but never addresses that "other" scenario. I even saw someone here say something to that effect in one of the FAQs so....

What do I do if I have a deck right up next to the pool?

I saw someone suggested using sand bags every 2 ft on the top rail. If we were able to bunch up the liner around/under the top rail would the bags work? Pool is apart, top rail is being repainted, liner has arrived and we are ready to go so quick help would be wonderful!

Thank you in advance.