The birth plan template I wrote I think is really helpful. A plan isn't about saying this is and this isn't happening, it should be about making sure they know the important things. Birth isn't a medical procedure, it shouldn't be about doing as you're told.
The thing with students is not so much about whether they're qualified to do what they do but whether they get in your way. You need to be allowed to retreat and feel safe, if there's a lot of talking going on around you, lights on and you're just not feeling safe then it can impact on the birth. If you don't feel that the person doing something to you feels confident in themselves that will have an effect. Ina May talks about a dad who needed a wee but didn't want to leave mum, he was so tense that she picked up on it and if effected the birth.
When I gave birth this time I had one MW sat by my side, slight angle so she could see what was going on and after she pulled the emergency button (the he stopped decelling so everyone left) there was one MW stood back at the end of the bed. I also had the neonatal team in the room preparing their equipment but they kept out of the way, kept their voices down etc. Even with the gestation keeping things right for the birth was the priority for them all - that hospital could teach many others a lot!
dgift - anusol is good for piles. If you can manage it, gently push the piles back inside and have a look for tips to minimise them, diet and toilet technique(!) They're not going to be a problem giving birth, if you don't have them at the time, they're likely to come back with the pushing but as you're not pushing from your bottom, they're not going to affect the birth. If you are worried speak to your doctor or midwife, it's a common pregnancy complaint so they're not going to be shocked.