Measure twice, cut once. Need I say more? Not a huge deal if you cut it too big, but you've been warned…steer clear of me if I have cut it too small. I can throw QUITE the hissy fit. This hideous scene can be avoided if I would only listen to my own advice.
When adding borders, measure across the middle of your quilt. Cut your borders to that size. Use Wonder Clips to perform the ol' Cinderella shoe trick to make your border strip fit to that size. Make sure that if your border is larger that your quilt center piece, put that on the bottom when you sew it so your feed dogs can do most of the work. To be quite honest, I'm not sure how I lived without these little buggers. I even use them for lots of things that don't ever involve sewing…chip clips anyone?
As much as you are tempted, don't push or pull your fabric. Let your machine do the work. Especially when sewing with Dual Feed, you just need to gently steer. Seriously, let Bernina take the wheel.
Change your needle and your rotary cutting blade more often than your natural instincts tell you to. You won't EVER regret it, I can darn near guarantee! If I had a quarter for every time I've said, "Why did I wait so long to change my blade," I'd be so very rich! I'm guessing you're not so different. It's a bit of a hassle in the moment, but the rewards are worth it. Save the hard work on your arm strength for the gym.