Yes, your 9-patch with 1/2 seams ends up 5 1/2" because you still have the 1/2" seam allowance around the outsides. You could trim the 9-patch edges back to 1/4" seam allowance, returning it to 5" square. This at least lets you use those already-stitched 9-patches instead of ripping them all apart.

Welcome to this board, lots of knowledgeable people on here. They are all willing to help.

I am with most of the others. Just rip, trim and move on. I rip so often it is second nature to me.

How many squares do you have to cut down? Do you have a long cutting ruler and rotary cutter? Lay the squares out in a line and cut them down. Turn and cut down again. You only have to cut two side to get the 2 inch square.

Break the task into 15 minute segments. You can do anything for a short time. You will soon have them ready to piece again.

I first thought they meant to take 5" charm and cut into four squares (2.5 x 4) and have 2" finished square?

That wouldn't fit the 5" charm. It has to start at 2".
OP, you need to recut them. Join me - I just did a bunch of Quarter Square Triangles wrong. Cut every 5th stitch on one side, them turn over and pull the thread from the other side. It should come out easily.

First - if you are a new quilter, making those tiny 9 patches are going to be difficult. I would save doing the tiny blocks for when you are a bit more experienced. Second, yes you can use 1/2" seams, but they bring with it their own set of challenges. I often have my very young students use 1/2" just because it it easier for them to watch and get correct. But, it can add quite a bit of bulk on the backside. So, it would be dependent on the block. Third - IT IS YOUR QUILT! You get to decide what you want to do and how you want to do it. There will be things that you try that don't work out and you will learn not to do them. And, there will be things you try that just make things so much easier - you are the boss! Only super rule is to have fun and learn stuff.

in this case - if it were mine - I would just recut the squares to the proper size - it will make the rest of the process much easier.

But - some of us have to try it "our way" - to believe/understand what the rest of the people are saying. :shock::rolleyes:

Thanks to everyone for all your help and suggestions and I'm sorry I didn't respond sooner. I am not very good at cutting and my blocks never seem to come out accurate. I have also learned very quickly that the cutting is not my favorite part of the process. The good news is a friend told me about the Sizzix and Accuquilt dies. I had one of the dies for the 2 1/2 (unfinished squares) and that's what I used initially by mistake. Sizzix does have a 2" unfinished square die and I have ordered that. I'll just recut them once the dies come and use the squares I've already cut for something down the road.

I am just so happy to now have a place that has so many people willing to help a new quilter. Thank you!!

There is a lot of good advice here...not only for this question (I've learned from reading these responses), but throughout the board! Hang in there and don't let this one moment discourage you!! We've all been there!! Welcome to the board!!!!