I always wash ahead but did get a kit from JoAnn's that was just to learn a block. The pieces were tiny, already cut to size & I was just doing the block to learn the process. I'm starting to wash my fabric when I buy it so I can avoid waiting for the laundry when inspiration hits.
Also, as Cecelia mentions, be sure not to use dryer sheets. I did and had a coating on my iron & a yellow mark I thought was a stain on my ironing board (came out with bleach in the wash). ***I'm big on bleaching in case you haven't noticed LOL.**** :lol: