sixpartseven said:^ I don't know about that. I have never had shaky hands mess me up when IVing. They would have to be shaking pretty violently to throw you off that bad. If they are messing you up, try resting your hand on the forearm of the arm you are shooting in to to steady it.
I think most missed shots happen because people rush through the process and try to hit as fast as possible. If you take your time (I know, its very hard when you're sick) and make sure you register properly before AND after releasing the tie (if you even tie off to begin with. I don't), you should never have problems with missing.
You guys are forgetting about the chance that you break though the vein after you register by accidentally pushing down on the whole set instead of just the plunger (or something along those lines). This has happened to me a handful of times, and is now the reason why I pull back a second time to make sure i'm still in. The reason that I do this is because i've actually missed shots that didn't hurt/burn/sting at all because i was in the vein to begin with and then broke though during the shot. So I recommend pulling back twice, once to see if your in the vein and the second around half-way though to make sure you're still in it.
Good luck out there.