I hope I'm not missing something...
I think that you are missing something, although of course everyone is entitled to their own views.
I'm even have access for a clean room
That is unusual for non-DR professionals who ask for help in the forum. Most advice to new visitors to this forum, cannot include any work that would require a clean room (or equivalent).
There is only one thing that may prevent me from doing it on my own: some expert show me how he would do it.
With respect, no, that is not the only thing. In many cases, specific tools (e.g. head combs), equipment (e.g. PC-3000), sometimes other proprietary software, are needed for successful recovery, in addition to the knowledge (know-how) that you mention, of how to use the tools & equipment etc.
I would even pay for it! You know, I'm a researcher who does try things to learn new stuffs.
Wanting to learn new things is great - but do not under-estimate the value (to the DR pros) of that knowledge (often self-taught at great expense in terms of time, and sometimes money too), and therefore the amount you would need to pay to get that knowledge from them. Of course you can approach the DR pros directly to discuss your idea and ask how much you would have to pay, for them to teach you.
I find one issue in DR community quite contradictory: we do not share info with the public as they will misuse it. Who cares?
Have a read of this thread, for some discussion on the subject: diy-what-the-big-deal-t12671.html
I think making the technical information more publicly available would have a positive effect.
Again, this is discussed in the above thread. Depending on where the "technical information" which you mention, has been obtained (many different sources are possible), some people have different views to you.
When you have that type of "trade secret" information, you can choose to distribute it widely if you want to do that, and others will be grateful.
But if it cost you 6 months of your life to get that info, and if it helps you to put food on your table, would you give it away and hence create more competition (as well as wasting 6 months of your life) and potentially lead to less food on your table? If so, then your altruism is exceptional.