The kit came within a week of ordering. I read all of the instructions and didn't think they were hard to follow. Yes, a lot of precautions but not rocket science. So, what's the problem? Well, collecting the saliva and collecting enough of it to fill not just one but four tubes. There is one big tube about four-inch long and three little tubes about two-inch long. You have to collect in the morning, at noon, twice in the evening (before dinner and before bed-time). The instructions say that you have to make each tube at least half-filled and that collection time ranges from 5 minutes to 30 minutes so I budgeted a little over 30 minutes for my morning collection, which was for the large tube. I started at 7am but ONE HOUR later, I had only a fifth of the minimum requirement. The instructions also say that smelling a lemon and pressing your tongue against your teeth will stimulate pooling of saliva. Well, I tried each of these but it didn't do much for me. Since I knew that the smell of food can stimulate salivation, I resorted to taking out some leftover Chinese stir-fry from the fridge and used the strong aroma to stimulate the saliva. Still, I wasn't collecting enough and I was about to be late to work. So I carried the test kit with me and drove to work, spitting into the tube at each stop light. I drove for almost an hour to get to work and by the time I reached my workplace, I still had only half the minimum required amount. Fortunately I had no phone call or meeting that morning so I was able to keep spitting while working quietly at my desk, ignoring curious look from co-workers. Another two hours passed and I finally collected just about enough to meet the minimum line. But wait, this isn't over yet. It was 11 o'clock and I had to start a new round of spitting into a new tube for the "noon collection". If I didn't start right away, I would not be able to finish the second collection and have lunch before 1pm. My "noon" collection was slightly short of the minimum line but I was exhausted trying and I had to eat lunch before a work meeting. I could only do what's humanly possible. My advice to prospective buyers: this test is very expensive and may not be the right type of test for you. If you have problem salivating like I do, you may not even be aware of this problem. Neither my mouth nor my throat feels dry; I regularly keep myself hydrated by drinking water and eating fruits and soups. So before you decide to spend $170, do a simple test: see if you can pool enough saliva to fill two tablespoons in a reasonable amount of time; if you can't, don't waste your money. Go for a blood test instead.