Share 'Riding up a slippery hill - how?'

Hey crossers,   Second-year Cat 4 here, tired of getting schooled on those steep short muddy hills that the better guys can ride up but I can't. I'm talking about the kind of hill that you can't carry speed into (eg., there's a steep turn at the start, or a barrier that slows you). What's the best technique?   Also wondering how you decide whether to ride up part way, then run. Or just run all th…