Actually, I couldn't sent the stuff out on a Sunday, so it went today and you will have it tomorrow. I use the 5fr tube, but I sent a 6.5 (a teeny bit bigger) in case that looked better to you. If you look at my Woe Is Noah thread, you can see how I hold the head. I don't worry so much about what the body is doing, but if you have assistance, it's nice to hold him in a straight line. Like head up, tail down. I only put it down the esophagus, not all the way to the stomach, so like 1/4 to 1/3 of his length, and then inject a little slowly so it doesn't reflux back up. But quickly enough to not stress him by the time it takes. Noah wasn't distressed at all, really, since there was no prying his mouth open. Once the tube is in the corner of the mouth, he will probably open his mouth a little bit, at which point you can see the trachea way in the front and the tube disappearing to the back, far from the trachea. To give an exact dose, after you have injected the liquid, you leave the tube in place, remove the syringe, draw up a little air, (couple ml) put the syringe back and flush with air to get the liquid remaining in the tube into the snake. I lubricate it with water- they are naturally slippery when wet.