Rock shox Monarch service

Has anyone carried out a service on a rock shox monarch rear shock?
I was looking through the service manual and it goes on about removing the nitrogen valve and a bit later on it uses a shock pump to recharge this port. Is this correct or am I missing something?
How easy was the service if you have done it.

I’ve only watched the youtube vid, but it looks not too bad a job. You do, however, need the airvalve adaptor to re-charge the IFP, and you’ll use air and not nitrogen (assuming you don;t have access to nitrogen?!) – which will make no real noticeable differance for average Jo. You’d probably want to replace the seals as well, if you do the full service.

It’s all here, he mentions shock pump usage in the comments

Cheers