Yes it can be easy but it depends on access.
In the bottom of a wardrobe is easiest as you can lean over and see what you are doing, you can also loosen the three screws holding the fan housing on, and with a twist it will fall back out of the way still attached and supported by the duct pipes.
Tip here is to remove the fire front before you start, saves your knees putting dents into it!
Below a drawer is hardest as you can only reach down with one hand, I know exactly where to plug it in and have managed a quite few like this, not to easy though, it hurts! but manageable
Main problem in both cases is the position of the gas flue pipe as it gets in the way of your hand lining up the 3.5mm jack plug, the plug needs to pass through a hole in the control box support bracket first before it can then go fully into it's socket, it must be fully home or it won't disconnect the original sensor.
Once connected you can feed the lead straight under the fires heat shield, there are handy clips on the fires base plate to then hold it down out of harms way.
Alternately it can be routed along the back and out around the outside of the gas valve, again making use of clips on the base plate.
Occasionally I've had to release the flue connection at the fire to allow a little bit more room, it is then imperative the flue is reconnected correctly using a new flue seal, this is best done or at least tested afterwards by a professional.
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