Re: I struggle sewing arm holes. Is there a trick to it?
I always turn and sew or put the binding/ sleeve on first....then sew up the side seams. When I learned how to sew I had an old vintage machine without a free arm....so I had to, 15 yrs later different machine....but I still do it for most tops. If you pattern has notch marks for placement...always transfer those to your pattern with taylors chalk or snip a little of the fabric (don't go deeper than the seam allowance though!).
also spray starch and an iron can be your friend!