ys it is easy
but:
have the pipes clamped firmly to the wall, as you have to twist the cap off the device with a big spanner, so the pipes must resist the force
allow about a foot of space above it, as you lift up the cap and long magnet for cleaning. if it is at a height where you can look down into the can this is better than having it high up
you may drip water out while cleaning so I put a basin or old towel underneath.
You will probably enjoy taking it off to see how much grime it has collected in the first couple of weeks. After a few months it will probably be pretty clean and not need doing for a long time.
If your system is not sealed (i.e. it has a Feed and Expansion tank in the loft) this is an easier way to add chemicals. Also, if the system is dirty, you can bale out this tank and sponge out the mud to prevent it flowing down into the system.
Once you have a Magnaclean fited, you can add a cleaning chemical called Sentinel X400 which loosens all the old black dirt, and it will then be collected by the Magnaclean. this is very satisfying. You do not have to drain out this chemical unless you need to drain for some other reason. Add it during the heating season when water is going to be be pumped round all the radiators for several weeks (the chemical loses its power after about 2 months, but by then you should have loosened and collected most of the dirt). If your system is fairly new and generally clean you can skip this. Edited: You say you are having in powerflushed, so there should be no need to use a cleaning chemnical again.
The Magnaclean only collects black Magnetite sediment, but this is most likely what you have got.
Make sure your installer adds a corrosion inhibitor chemical to prevent future corrosion when refiling.
I am just a householder.