Naturally, there are a few things you might want to have to make your life easier (and there are more gadgets appearing ALL THE TIME.) Here are some of the things I use pretty much anytime I’m sewing anything. If you have the means, they are worth having.
Scissors. I do get tired of biting thread with my teeth. If you are just doing the most basic fix-the-clothes-so-you-can-get-to-work, it doesn’t really matter how wonderful the scissors are or how sharp. You just need something that will cut thread (whatever kind you have) fairly easily. There are many other sharp things that will work, but I don’t want to suggest anything that might get you hurt. Primary school scissors work just fine.
Seam ripper. This is a handy device whose sole purpose in life is destruction. It is the crowbar of the sewing world, but much smaller and MUCH sharper. Sometimes, even before you can sew up the patient, you have to clean out the wound. The seam ripper is happy to help. (How’s that for mixed metaphors? Anyway, get one.)
Pins. I usually use straight pins, which, surprisingly, are just….straight. A straight little piece of metal with a sharp point on one end and a plastic, glass, or metal “head” on the other. I personally prefer the ones with large, white plastic or glass heads, because I can spot them and pull them out of fabric before a) sewing over them (which causes shrapnel!) or b)ironing over them, which can cause melted plastic. Ew. You can also use safety pins, diaper pins (those both take a bit longer to attach and cause more distortion in your work, but you won’t get poked as much), clothespins (really—especially for thick, heavy, grumpy materials), or bowling pins. No, I made that last one up.
As I said, there many more “things” available to make sewing easier (notably, you know, sewing machines). But with these and the most basic-est basics, I can sew anything, eventually.