HELP swim /bike/ run swim/ bike/ run.Transition help

 I have a F1 style tri on Sat and need some advice. It is a 1500 meter swim, 25 mile bike, 10k run/ 750 meter swim, 25 mile bike and 10k run.

1 Do you try to put your wetsuit on again after the first swim/bike/ run

2 Do you bring extra cloths ie: socks, tri shorts, sneakers.

3 Easy and efficent way to get bike shoes on and off for transition.

4 Will I have extra room in transition for extra cloths or drinks I will need

5 Is it harder than a 70.3

If there is any other suggestions please help. Thank You