Yes, definitely make arrangements before getting to the venue. Don't go through the promoter, ask the other bands direct preferably in a group message. Strictly speaking, the headline band provides backline to help switch around times but never assume this! Also, headline band would be first to soundcheck so makes most sense for them to provide the gear.
Just being courteous and polite to other bands goes a long way. You won't have to do that awkward shuffle towards the other bands before your soundcheck - "Er, alright mate. Can I, er, use your amp?" Most the time there will be monitors anyway so bass players find it much more appealing when you say I won't be touching your amp settings because I have a DI pedal to use for our set.