Oh, definitely make sure you're home, and planning on STAYING home, when you try any new foods. I will only say this-- there's one thing with stinking up a public restroom pre-op, but it's a whole different ball game post-op!!
I'm honestly surprised the stench doesn't cause innocent bystanders to pass out!!
As for a scale, I have one of the Weight Watchers ones (ordered it from Target online)... it's not dreadfully reliable (it'll give me 3 different numbers if I get on 3 different times in the span of 2 minutes, all within a pound or so), but it CAN read up to 350 or 380 lbs. I have sworn myself to a pledge of only getting on it ONCE per week, on my weekly "anniversary" day. (Which means I get my Week 2 numbers tomorrow, woo hoo!)