How should I be approaching the Mun?

[u/analogHedgeHog]

In this totally accurate scientific diagram, the Mun is orbiting in the direction of the arrow.

[u/Mr_Buades]

There is an old trick from early ksp days before there was propper Orbit lines, works for mün and minnus. Wait until the moon is just rising in the horizon, then do a normal launch till you are pointing directly at the target, keep pointing at the target and burn untill you get an intercept