In reply to CrimpShrimp:
I borrowed books from the library and went out and did it. Along the way I have sometimes met people who are more experienced in a certain aspect, and I learnt from them.
Courses are great for learning stuff in a concentrated manner, and to receive an objective assessment of your skills, but they are by no means essential if you can't afford them.
On the other hand, look out for BMC skills courses and Conville courses in the alps and Scotland - heavily discounted and targeted at younger people.