Go with a positive and confident attitude. Focus on a couple of skills you are confident you can do well, to give your mentor confidence in you.
Take a small notebook that you can slip in your pocket where you can record important bits of information and your experiences and keep on top of writing up your paperwork every evening otherwise it can get out of hand. Being organised, or learning to be, is very important
Have the confidence to ask to practise your skills as soon as you feel able. The more you practice the better you will get. You might be nervous the first couple of times but it will get better quickly.
Ask questions - there aren’t really any silly questions and most mentors will be happy to see that you are interested and trying to improve.
Observe your mentor closely for the first day, for example how they talk to patients, organise themselves and complete tasks. Each mentor will have a different way of doing things and will often expect you to adapt to their way of working. So, just watch, then take a deep breath and go for it!