If you can place them by targetting a raised goza mat then you can try placing tables on top of each other, then 2 damaged book piles, then placing the goza on that, then the banner. You will want to make a little mini elevator out of 2 gozas for you to stand on to get higher up if you want the banner very high.
Mini elevator:
Place 2 goza mats next to each other and right by the area you are working on. Raise one goza up 2 times and stand on it. Raise the other goza up 4 times and stand on it. Raise the first goza up 4 times and stand on it, etc. This really only works well outdoors (front steps or on roof), you can only stand so high when there is a ceiling hitting your head.