I think I had the case of the DUHs yesterday. I tried to sew a 60" round tablecloth. I bought three different materials; two to make two outdoor tablecloths and one for my dining room. I made one of the outdoor's first, I figured if I messed it up it was going to be for outside anyway so who would mind. It actually came out okay, only thing was when I cut it, I ended up with two halves of a circle instead of a full circle.
Figured out I didn't have the material folded right. Okay no problem seam it down the middle and I'm all set. Just remember this for the next one.
The indoor tablecloth is a little more work because the material is only 45" wide. What you do is fold the material in half and cut it. Then you take one of the halves and cut that in half lengthwise.
You then put those two pieces on each side of the first half and then you need to pin both seams and sew them together. Then you fold and cut. I made sure I had two fold lines before I cut and viola OMG I had two halves of a circle again. I looked wrong OMG I did it again. Okay I'll sew it together in the middle. I'm not going to use this one as my tablecloth.
I'll use the material for pillows and maybe a Wee Bunny.