You can do it, Polpessa. I'm an impoverished student and my goal is to dive once a month. The key is to make a budget.
Here's my situation. I'm open water certified; I own only a wet suit; I live two hours by car from the nearest shore diving. This means that every dive trip costs me about (1) $40 in rental gear, (2) $5 for air fills, (3) $10 in gas (I have an old truck for transportation). I don't know how these prices compare to costs for the same things in Switzerland, but for me each day of diving comes to less than $60. That's only $2 a day to dive once a month! If you dive just once every two months, that's just $1 a day. (I'll let you figure out the Swiss equivalent to my American $'s in the following.)
You can absolutely save this much money each month, and you don't even have to do anything dramatic. This worked for me: Keep a careful log of EVERY expenditure you make for six weeks or so. You'll be amazed when you discover where your money actually goes. Then, figure out which expenditures you can systematically eliminate. I was shocked at how much money I was giving to Starbucks, so I started making my own coffee instead of buying it out. That alone was almost enough to keep me diving!
Once you've figured out how to put $2/day away for your monthly (or whatever) dives, figure out a way to put an extra dollar away toward a piece of equipment or a major dive trip. Slowly but surely, you'll get there. And once you own your own equipment, the cost of your monthly dive goes down, so you can take more often... See? Make a budget, take some small steps toward saving, and you'll be diving.
Good luck!
-steve
