that is pretty much the process,
you probably also need to gently pry the gap of the slot, open larger to release the heater capsule before sliding it out...
chances are that there is old charred and molten filament crusting this area up, so you may also need to heat the heat block up as well, to release the old heater capsule
Be careful not to burn yourself, and treat the thermistor wires with great respect, they are very fragile
when reassembling, pay particular attention to the alignment of the cables and cable ties, as the heads of the cable ties may prevent full movement of the X axis, if incorrectly aligned
there is a raised head screw clamping the heater capsule into the heatblock, it needs an Allen key (Hex wrench) to loosen it,(might need to heat the screw up, to get the Allen key into the hex socket)
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.