I should add - cut your base fabric much larger than the block. You need enough overhang for the hoop to have something to grab on to when you shift it towards the edges of the block.
I said in my previous post you don't strictly need to use a base fabric for embroidery, but in this case because you're using blocks that are already at their full size, if you use a hoop then you'll need that base fabric with overhang otherwise you'll have trouble getting the block taut enough to work on the edges, which defeats the purpose of the hoop. If you go hoopless then you don't strictly need base fabric, but your work will look MUCH better with it, even if your stitching is very even.
Anyway, sorry for the huge posts lol. I just figured I'd give you all the tips I've learned along the way, maybe something will help you.