I used a write up I found on that other place and checked the valve closings by sticking my head down and looking at the valves. 1 and 3 were closed so I did them first. Then I put the car in reverse and pushed it little by little until the 2 and 4 valves were closed. Blast away and done. The first time it took me about 4 hours because it had never been done on my car before. I have a DoS intake so removing the intake manifold is a cake walk, 15 minutes max. Also that little bolt in the back that is a pain to get to, you don't have to put it back on, I never did. I used a harbor freight media blaster $40 or so and they also have walnut shell media for about $35. The manifold adapter and blasting wand I bought from Home Page. He 3D prints the adapter and fabricates the wand adapter to work with the Harbor Freight media blaster. Not too hard really, more just murder on your back. The taller you are the worse it is, unless you have a hoist. The air compressor seems to be the tricky part for most people. I'm a Service Advisor at a Toyota dealer, so I have a giant air compressor available to me. I used to run a BSH catch can, but that never really caught anything but a small (very small) amount of oil and lots of condensation. So after 15k I sold the thing and I'll blast the valves every 15k or so. And when I did the service I tried taking pictures, but I had an iPhone 5 at the time and couldn't get anything to focus. I might be able to focus in now with my 6+.
Just to follow up, I did my own too and it turned out really well.... To check the valves being closed I pulled the valve cover off and watched the cam lobes. I turned the engine over (mine's an automatic) with a socket and ratchet on the crank pulley nut. I also bought the factory wand, which you hook to a shop vac to suck all the particles - both the blast media and the carbon knocked loose - out as you blast. I did take my car up to school where I had a pretty much unlimited supply of dry compressed air, but it didn't take that much, I think I could have easily done it at home with my little compressor. The results were pretty amazing, they basically looked like new when I was done.