Details of this can be found in the Pain Comfort 1 & 2 videos in the Online CPNE Workshop.
Don't confuse Pain Management with Comfort Management. There is Level of Pain, but there is no level of comfort or a 0-10 scale for comfort level.
The critical elements say ASSESS COMFORT NEEDS. This can be done in two ways.
1) You can ask the patient questions regarding their comfort needs. This can simply be done by asking anyone... "What can I do to make you more comfortable. Can I reposition you? Can I... intervention 2? Can I ... intervention 3" or you can offer 3 and ask which one they would like you to do first. In your narrative notes, you always start off with "Patient's comfort needs were assessed. Comfort measures were offered... yada yada yada more details on which interventions, did patient accept, and response... what did patient say right after you repositioned and you asked it that better?
2) Observing behaviors indicative of discomfort such as grimacing, giving out grunts when repositioning etc. You don't always have to ask, the patients' behavioral characteristics can also be very revealing!