Feline Fanatic has given you some excellent advice from a long arm perspective. I have found that when you have a complex block that has lots of seams coming together in the same spot, first try to "twirl" the seams to lay them flat--if that doesn't work, then I do sometimes press them open.
One problem I run into with SID on long arm is when a seam switches sides it's pressed to--it causes the SID to suddenly jump over unless the quilter is extremely careful.