Take it! You will learn as you gain experience and as long as you try hard and treat the horses well you should be fine.
Take it! It will be a great way to further immerse yourself into the horse world, and a great learning experience.
take it. I was the same last year feeling very inexperienced compared to the other riders around me but accepting the job was the best decision I made I learnt so much and although it didn't work out long term it lead on to new opportunities.
Only one way to learn....