I think we might be assuming that you are training towards a NPPL(M) in a 3 axis. Are you a NPPL(M) recently "difference" cleared to a 3 axis without coveing powered approach?
Ah yes, that's the assumption I made.
Also what are you learning in? A C42 is just like a conventional aircraft, where an early series thruster is more of a proper microlight, and both will have completely different approach styles.
One good tip would be to find a power setting that will roughly work in still winds, then you can just adjust it for the wind. It won't work 100% of the time, but it will be a good start point.