Just to echo the opinion of some others, I learnt to scrape entirely from reading and viewing material online. I watched loads of videos on YouTube, sometimes over and over (Nick Mueller has some good ones), and read lots of posts from Richard and Forrest.
As other people have said, at first I didn't know whether I was doing it right or wrong, but after 5-10 hours of practice over a few months I was able to consistently make a part flat and spotting evenly, and I now feel very confident.
Personally, I find the measuring/analysing/strategising side very easy, but the hand coordination and feel the hard bit. I also have the type of temperament to not mind scraping, I quite enjoy it.
I would buy a Sandvik carbide tipped scraper to start with as I learnt quickly you don't want to be messing around with blunt or inadequate scraper blades when your skill is low, as you won't know whether it's you that's doing something wrong, or that your equipment is blunt/wrong. I wasted about 3 hours using an HSS scraper that was just polishing the surface and I didn't realise.
Other than that you can get started with just a surface plate, but within a few hours your blade will need resharpened so then you need a diamond wheel for your bench grinder, then in due time you'll probably want to buy or make various types of straight edges etc (good practice to scrape these in anyway).
Cheers
Rich