In reply to ssstrick:
Arguably there are four main routes:
1) Teach yourself, go with friends and learn together. Cheap, rewarding, likely to be slow way of learning and potentially the most hazardous. Works for some.
2) Go with other experienced people. Cheap, rewarding, quicker way to learn and should be safer - if the 'experienced' people are knowledgeable and have the right skills. Going with a club can be a good option.
3) Pay to join a course. Costly, rewarding, fast pace of learning, you should be able to join a course that, once completed, will leave you with sufficient knowledge and skills to choose your own suitable routes and climb them independently afterwards. ISM, Icicle and Jagged Globe all come highly recommended.
4) Hire a guide. Most expensive but probably the fastest and most efficient way to learn to climb in the Alps independently. I would recommend a British Mountain Guide.
So it is a matter of choice depending on how much money you have available, how much time you have and which you would prefer. People use all these routes.
Looking at your previous experience a guide may work best as they can tailor their input precisely to your needs.