It is possible – bit awkward on the back side – but you are young and limber! Try it, the worst thing that could happen is it does not go, you wash up and make appointment.
When I was doing it to myself – I found the worst part to be the fact that you start sweating from the whole exercise and that makes it harder for wax to stick…
Not sure what to recommend for that – cause I did not find the way around it. An advice I can offer though – make sure you have big towel to sit on – it takes time and you will make mess.
Good luck J