Welcome aboard fillylove! Greetings from Guam!
I don't know much about SSI, I was trained through PADI, but I've learned that there are both good and bad instructors with ANY agency. Does your instructor have any assistants or divemasters helping him in the water? Is he taking all 8 of you in the water at once?
If you feel uncomfortable about ANYTHING...make sure you let him (or his divemaster) know. Take it as slow as you need too...and enjoy!
As for the gear...I don't really think any manufacturer is better than another. It all depends on what you are looking for. Higher price doesn't mean better quality. Wait until you are finished you class before you start looking at buying gear. But, quality name brands are: Scubapro, Aqualung, Seaquest, Oceanic, Mares, Tusa, DiveRite, Zeagle...I know I'm forgetting some, but I'm sure other people will add to this list!
Hey, I saw you were a animal surgeon. Same as a vet...only more so??? Love your name! I have a bunny and 4 cats (only had one to begin with...but a stray adopted me and had two kittens!) but my first love is horses!