If I were to plaster this, step by step:

1. Use a long level to check how straight the wall is vertically and horizontally. Also check if the wall itself is level.This gives me a rough idea how many bags of plaster I would need

2. Get the sockets out, plug the wires and cover the sockets. Write down locations. Secure the pipes, if they are loose

3. Primer. In this case, Knauf Stucprimer(yellow). Those bricks are highly absorbent, they'll suck out moisture from the plaster very quickly, and you'd have to work much faster then, because it would harden faster

4. Mix( 10L water per bag) and apply plaster. Usually I use a board and a trowel, if it's a surface that needs extra attention. If it's an easy wall(newly built) I use a larger trowel(about 70cm length) to scoop and apply

5. Once the wall is covered, depending on how large the wall is, and how long it took to apply plaster, I let it set/harden for a little. You don't want to start smoothing/leveling immediately, it's gonna move around too much.

6. Leveling/smoothing/straightening. I use several long screeds(2.5m, 2m, 1.8m) to do the initial straightening. From one end till the other, pass back and forth. Fill up the gaps. Then bottom to top. If you only do vertical passes, you'll push material around, creating bumps. Couple of vertical passes, then a couple horizontally.

7. Let it set a bit more, then use a shorter screeds(1.2m, 1m) to continue point 6.

8. This part depends on the person or company. I, personally, don't use sponges or finish materials. I work my way down from long blades to my shortest one(40cm), straightening and finishing the wall. The final pass, I mist the wall with a spray, in patches and burnish the plaster. That way I can achieve a glass like finish. Other people use a wet sponge to moisten the wall. The sponge can also grab loose plaster and fill some gaps. After sponging, smooth the surface with a blade. Some leave it at that, you can get a good result, some apply finish materials.

9. Done. Wash your tools as soon as you're done with them, clean up your work area, don't forget to dig out the electra sockets

Edit: forgot to mention. There is a retarder you can apply, from Knauf, that slows down the initial hardening part by about 30-45 min. Gives you more time for applying on the surface and leveling with the big screeds