I think you'll find the software reasonably intuitive.
Printable View
Mike is quite correct. Calibrating your screen and creating a profile is quite straight forward - just do what the software tells you to do. The main "issue" of setting the brightness is really driven by the conditions in the room where you do your editing. I work in a relatively dark room with fairly mute lighting, so I find the "standard" of 120 candela / square meter a bit brighter than I might normally use, but that at least gives me the confidence that I will be seeing the image at the same brightness level as others who are using this level of brightness.
Hi Javier
That's a very good image you have there, nicely done.
I have a Spyder 5 PRO and as Mike and Manfred have indicated, it is quite straightforward to use. The software opens up with an inter-active wizard which guides you through the process. When you get to "Identify Controls" , you have to select between Brightness or Kelvin presets, depending on the type of monitor you have. I'd suggest you run with Brightness as this should apply to most monitors whereas Kelvin Presets will probably not apply to a lot of monitors.
Not long after this you will be asked to place the Spyder device near your monitor to measure ambient light. The software will then give you a recommended value to set your monitor to. In my experience, this tends to be somewhat high at least for my monitor and frankly I don't think it matters that much if you don't have your brightness set to exactly the recommended value. "As long as it looks reasonable" is the path I follow!
Apart from this brightness setting, everything else is pretty straightforward as you follow through the instructions in the wizard. At the end of the process you get to compare the results from the before and after profiles.
Good luck.
Dave