The installation of your roof panels will be extremely difficult so I suggest that you do it in stages and not all in one day.
Following the instructions carefully begin your roof panel installation. The largest right side panels go in first. There is no hint I can give that will make this easy except to have patience and a mallet. Make sure that all of your tabs go into the slots. Tap everything in with a mallet but be gentle because these panels go on very delicate and flimsy roof supports that will break if you force them too hard. This roof structure is very weak so after you have the right side of your roof finished, clamp and let it dry overnight.