[header] How to lead climb indoors [title] Check with your local climbing gym about their lead climbing policy. [step] Most climbing gyms require you to have a lead card or certification, but the specifics of how they carry this out vary between facilities. In particular : [substeps] Most gyms offer lead climbing classes to educate the beginner. 
But you might need to be able to climb at a certain level, or have certain gear, before joining the class. If you're already an experienced climber, ask if you can demonstrate your lead climbing ability without having to take the entire class.