Tiffany it's going to be okay, we all want it to be perfect so we walk around pondering the best spots and then say yeah but later it will get big and change our minds. I promise it's not just you. I have 5.5 acres and still do the same thing. The good thing about Hydrangeas is they can take a good bit of shade so you can plant them under a tree and they will still grow. planting under the south facing side of the tree would give you the most light but basically anywhere will work. Also high density planting means less weeds. So cramming things together is sometimes a good thing. If something is getting too big just dig it up in fall and move it to another part of the yard.
