I am by a long shot, not the best nor most precise block piecer in the world, but I will let you know this, if my block is going to be shared with someone else, it will be squared and ironed and the size requested.
Some time ago, our group was to make a quilt for a friend who was getting married. All were to submit 8 blocks. The quilt was huge. I am sad to say that many of the blocks were so poorly constructed that we did not use them. We ended up making lots of blocks. A few of the women whose blocks we did not use, came up to the quilt and actually claimed to have recognized a few of the blocks they had made. NOT!
It certainly gave me another view of some of the members of the group.
And, although I will not be hard on myself if I make mistakes I will certainly try to do a good job. So, don't take your imperfections to heart, just try the best you can.