No matter what quantity you get, may I suggest that you only use a portion of it for your first extract. This way you make sure you have more if you mess up. You won't mess up if you follow the teks, but you will learn a lot your first time. You might find that you want to use different hardware for your extraction. This could be any thing from the container you use for STB or A/B, filters, turkey baster or sep funnel, and evap dish.
I've only done two extractions, but those where from one order of bark. I did learn and changed some hardware for the second, which went much smoother, even though it was with 5 times the amount of bark.
Happy extracting,
Reosed