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After this I think the next step should be to build a clean room, go for a disk imager and will leave something like PC3000 for the last stage.
Just my opinion: your order is wrong. I'd recommend first disk imager, then pc3000, then clean room.
Once you get the disk imager, you'll learn all you can do before pc3k and clean room are necessary.
Once you get the PC3K, you'll learn all you can do before a clean room is necessary.
Once you master the PC3K, you'll learn all you can do before a clean room is necessary.
I don't understand why people want to learn about clean room recoveries so badly when they aren't needed to recover data from the majority of bad hard drives. They think they need a clean room for data recovery, but a deepspar and pc3k alone can recover data from
most bad drives (certainly not all). Not to mention, unless you know all the capabilities of deepspar and pc3k, you can't properly diagnose a drive to decide if clean room (i.e. head swap, platter swap, etc) is necessary.
For example, do you want to learn to swap heads so you can fix clicking drives? Well, a clicking drive doesn't necessarily mean the heads are bad. If you can't diagnose a drive correctly first (using pc3k), then you may be swapping heads or platters for no reason and risking the data.
**WARNING: It is, however, of the utmost important to realize when a clean room is necessary and not risk hurting a drive using an imager or pc3k.
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I know that it could take me about 1-2 years for really master this area

Try: a lifetime (which, in the US is at least 15 years, but since you're in Spain, the most it would take you is 40 years:
http://en.wikipedia.org/wiki/Life_imprisonment 
).