About a week ago I posted on here about a problem I was having with a block for a Storm at Sea quilt. Someone suggested that I paper piece the block, so that's what I am doing. I don't have much experience with paper piecing, so I'm hoping y'all can answer a few questions for me before I go much further. When do I trim the seam allowances for each piece added to the block, and when should I remove the paper from the back. I am concerned about the bias edges that will be on the outside of the block. See the attached pic of various steps in the block.