About canulas and gas. (and I wish honeyBunny would come back - she may be able to give better advice here!).
DS had hid first couple of GAs with gas, because they told me it would be hard to get a canula into his hand at such a young age. This was borne out by the fact that each time he came back, he had the canula in his neck, and marks from failed attempts in both hands.
IF, as in Soulgirls' DS case, there is a lot of difficulty, I would ask (or insist) that they use gas first. They don't like doing this inneceesarily because they have to have 2 aneasthetists present, and there is a potential risk because they have an unconscious child but no iv canula in place should they need to administer some other drug quickly. That's why HoneyBunny said earlier that you need to leave immediately once your child is unconscious.
One time, I was faced with an aneasthetist wanting to use a canula - and no magic cream had been applied, either, I refused, because I didn't want DS to start having a bad experience, and knew that a canula had never been succesfully put in his hand, so I stood my ground and said 'no'.The nurse explained that they couldn't do the gas becuase there wasn't another aneasthetis in the room - and I said 'well get one then'. I saw the anaesthetist mentally tot up the currency of a full orthopeadic surgery team scrubbed up and waiting the other side of the swing doors, and another anaesthetist was summoned. Sure enough, DS came back with bruise marks in his hands and a canula in his neck, so I'm really pleased I didn't give in.
But for a slightly older child, and with the 'magic cream' applied, a canula will be fine, and the best method. Thats inmho, anyway.