The transition area is just outside the pool, so you only have a few metres to run barefoot (but yes, it is what everyone else does, even if it's a long way).
And you're right about the numbers - pin it to your top and put it on after the swim. You'll be given a swim hat to wear at the poolside, it won't be numbered, but the lane marshall will make sure it's a different colour from everyone else swimming in your lane so he/she can see who's who and count lengths properly - they will also indicate to each swimmer when they have 2 lengths to go. There's likely to be 3 people in your lane when you swim, maybe 4.
It can be muddy in places on the run course so trail shoes might give more grip, although unless it's been really wet in the lead-up to the race you won't have any problems if you wear normal road shoes, and that's what most people will wear. Road shoes are more comfortable if you go sockless.
Glad you enjoyed it Vici, tyhere will be another one at the same venue on 8th March next year, hopefully we'll see you then.
Leaving a drink in transition is a good idea, but for such a short event plain water is all you need - assuming you've eaten before the race and aren't running on empty you're not going to run short of energy, so the Lucozade (or any other energy drink) won't do anything, and in any case it takes at least 20 minutes for the energy to reach your system, by which time you're well on the way towards finishing.
My club, Burntwood Tri, organised yetsterday's Burntwood Aquathlon, and many of the 190 entrants were new to the sport. Swim times ranged from 20+ minues to under 4½, so no worries about being a bit slow. The course at Wombourne is ideal for a 1st multisport race.
The one in Lichfield is the Burntwood Aquathlon, and it's on 16th November. The race is based at Friary Grange Leisure Centre, it's a 400m swim in an indoor pool followed by a 5km multi-lap run around the playing fields. We also run junior races on the same day, various distances according to age group.