Daytonite - just a thumbs up from me. That truely is an AWESOME site for students (the one the OP pointed out) it's excellent!
On a side note - do put the tourniquet over the sleeve - your instructor will be impressed and the patient will appreciate it.
I had a job where all I did all day is start IVs
Hints from me.
1. Pull skin tight
2. don't go on sight alone - go on feel the veins you see are usually superficial
3. start from the hand and work up finding a vein (salvaging veins for later pokes)
4. bevel up
5. once you feel the pop (you'll know what I mean when you feel it) advance it just a tiny bit (Whole needle) then advance the catheter off of the needle and hold pressure above the insertion site (to keep it from bleeding alot) and remove the needle. Switch to previously set up IV set.
6. Always have your tape ready - ripped into sections thin ones for over the cath/butterfly
7. always have your iv set primed and ready with fluid.
8. tape down cath before putting on the iv protector film (can't think of actual name lol).
9. secure 'loop' so that it won't be easily dislodged making it a requirement for another iv poke.
10. above all - don't tell the patient it's your first time - bite your tongue, because they will tense up and will make it harder to do - after you are finished is the time to say 'that was my first iv start
good luck - well it's not a matter of luck it's skill. Believe in yourself - it will help you accomplish all things.