Hate to tell you, but if your hubby holds your hand, you won't be able to do a good job. The effort takes both hands. lol
Just kidding.
So what is the worst that could happen?
You may miscut something. Odds are, you will. Then you cut a new piece and move on.
You may sew some pieces together wrong or with an inconsistent seam allowance. So as a result your blocks may not match perfectly.
It's all part of the learning process. Jump in, do the best you can do and follow the instructions. Along the way you will learn, and try new methods and grow in the quilty craft. Hopefully you will have fun too.
We all started where you are. Oh yeah - and when you mess up the fabric - you get to go buy more. lol