Okay, noted; it's now living on the window sill.
I've kept it in the pot it came with, ahead of repotting when I get can buy some better draining soil, but — for the time being — it's just in the soil it arrived in (see picture). I gave it a little water on Tuesday, then a more thorough watering today, so I probably won't be touching it until next Sunday-ish I'll bet.