I have a toenail infection it is yellow and a new nail is growing underneath please help i am scared?

i'm going to a chropidist on monday and i am a real worrier i need to no what they will do and if they will do it on the first opointment and if it will hurt thank you xI have a toenail infection it is yellow and a new nail is growing underneath please help i am scared?
just a simple fugi problem Don't bother with cheropidist go to the chemist will cost you a minimum

lips