My milker came with a diagram/picture and instructions. Instructions were a bit vague but I easily figured out what to do. I have noticed if the teat gets in off center, little to no milk will come out. Milking three goats, I usually have to reposition one or two teats. I thought the noise would bug my goats, it doesn’t. They actually seem to like it better because it is quicker than I am. Two goats have little teats that I can only get my thumb and one finger on, the milker doesn’t care about size. It works fine on all three. I do notice that I have to hand milk at the end because there is still some milk left in the udder, takes me a minute or so per goat. I do wash with soap and water then run an milking acid wash through everything. The wire brushes work great, too. No issues with mold or build-up. There was also extra parts that at first threw me off until I realized they were spare parts. I will post again in a few months on durability.