Sewing Tired - Avoid It!

I sewed two cushions today and the second one took me twice as long to make as the first. What went wrong?

• I pinned the wrong sides together. Twice.
• I sewed an edge so crooked, it looked like I'd had a very strong gin & tonic beforehand. (Once) I had not had a gin & tonic. Though it sounds nice, come to think...
• I  sewed the wrong edges together. (Once).
• I tried to fix a mistake through some creative rejigerring. The rejigerring did not make the problem go away, it made it worse.
• I trimmed the problem edge, thereby cutting into the fabric. 
• I sewed another seam, burying the pinked slash job deep within. No one need know.
• This made the resulting cushion cover too small.
• This means you can never look at the back side of the cushion!

Still, I've been looking at four cushion fillers still in their package for about two months now. And few weeks ago, I had never made a cushion cover, so I'm happy. Very happy! One more to go, but only once I'm rested.

P.S. I think I just made up the word rejigerring.