Getting into a liferaft is a struggle. Practice in a warm swimming pool first. Make sure the liferaft has a cover and a boarding step - and a way of getting any water out when you're all in.
I asked SEMS once if I could inflate my raft and do that, prior to sending it to them for a routine overhaul.
They said NO because the gas comes out of the cylinder very cold and makes the rubber brittle. When they test inflate the rafts they use room temperature air.
Disagreeing with a suggestion to wear a drysuit is a bit like laughing at Bob Geldof when he says that today we will abolish poverty, but I still don't advocate the wearing of one because it makes an already rather antisocial activity even more antisocial.