Well I already have the Oxy Hacker's book and have read it cover to cover and keep referencing it. I mix all my own Nitrox currently under the supervision of my shop owner at the store, since I am a DM candidate with them, they have me do all my own (and a lot of other's) tank fills and mixes for practice. It really just comes down to them being very much a recreational shop, and if you look at their Nitrox mixing logbook, it's pretty much confined to me and one other customer. They only keep one bottle on hand and there have been many occassions where I couldn't get the mix I wanted, because their cylinder was too low. I can't fault them for that since like I said, they are a recreational shop with very little Nitrox. So my instructor and I have been discussing me getting a small 2 or 3 bottle O2 cascade at home, doing the O2 part of the mix at home, then taking the cylinders to him to top them off, that way I have control over my mixes. I appreciate the suggestions as far as safety goes, since that is obviously a top concern of mine, hence why I seek the experience of others on here.
Thanks,
Jim