So many rules and warnings. :lol: I'm glad I'm not a novice quilter...I'd be scared to death about now!
Some say press to one side to nest seams, some say press seams open; some swear by starch, some refuse to use it; some are obsessrive about scant quarter inch seams, some just go for consistency; some glue, some pin, some pinch, some poke with a stiletto.
Best advice I can give you is to try all these tips and tricks, give them a good chance to show you whether they'll work for you, and then go with whatever one(s) you are comfortable using that give you the best results for your effort. There is no right or wrong in quilting.
Above all else, quilting should be fun...matching seams should not put terror in your heart, nor should it be more work than it's worth. Relax and enjoy the ride. ;)