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See title. I’m getting the Marauders vs Enforcers starter set, and I haven’t used resin models since over a decade.

What are the things I should know going in? Any tips for good practices?

Obvious safety measure, don't sand or file the mold lines without a respirator and clean up thoroughly afterwards. Or just use a very sharp blade to clean them up.

Alright, not phone posting anymore. This kit is the one I'm getting specifically.

It states "We recommend washing resin models in warm, soapy water before painting," which is not something I've ever done with plastic models.
Do I just soak them? Do I use a brush or something?

 JNAProductions wrote:
Alright, not phone posting anymore. This kit is the one I'm getting specifically.

It states "We recommend washing resin models in warm, soapy water before painting," which is not something I've ever done with plastic models.
Do I just soak them? Do I use a brush or something?

Resin isn't the same plastic as, say, a Gundam kit. It's more like a 2-part epoxy, and requires a sort of oily coating to get the model out of the mold without breaking or sticking. If you don't wash the model, paint won't stick to it. I find that just soaking the model in soapy water (like you'd use to wash your dishes) usually works.

Warm water and an old toothbrush is best to get as much mould release out of the cracks as possible. Don’t let the water get too hot as stuff can warp.

 JNAProductions wrote:
Alright, not phone posting anymore. This kit is the one I'm getting specifically.

It states "We recommend washing resin models in warm, soapy water before painting," which is not something I've ever done with plastic models.
Do I just soak them? Do I use a brush or something?

I have those Enforcers - they are made from injection moulded plastic, just not the same sort as GW use (it's not high-Impact polystyrene ) - but it's not a PU resin like FW. The jetbikes are cool models, and the polycement I used glued them fine. This stuff still has Toluene in the solvent mix, though - so it's a bit more aggressive than current gen-stuff (Euro ROHS regs meant certain polystyrene cements have swapped out Toluene for n-butyl-acetate, which isn't as harsh a solvent on plastics - and smells fruity). Not usually an issue for most gamers, though, as they seem to use superglue for everything (and usually too much of it as well).

As for cleaning. Some warm (not hot) soapy water and a stiff toothbrush will do you. Give them a scrub, then let them dry.

Forge World has this, for info on handling their resin models:
https://www.forgeworld.co.uk/resources/PDF/Datasheets/Working_with_ResinFW.pdf
It can't be too far out, since the warnings on Mantic's page are almost the same as Forge World put for their models.