The clinic I went to wasn't nerve racking at all, the people seemed to really care less what was going on. The worst you could expect is that someone stands directly outside the door and listens to you. You have a bathroom to yourself. They can do a supervised test if you give them cause, but I'm not sure what you could really do to raise any suspicion. They are not allowed to be in the bathroom with you during the drug test if it is for employment, the only people that have to worry about being supervised are those in the military or on probation. If you are going to sub, use quickfix 4.0, it works, no questions asked. I used two bottles, but afterward realized I really didn't need to. The clinic I went to was only concerned with getting enough pee such that it was above where the temp strip was. The temp strip is totally accurate that comes with quickfix. Practice subbing and smoke a fatty, those are my two biggest suggestions. Just order yourself some quickfix and put any worries out of your mind.