Considering Per Diem/PRN Nursing

I'm an RN with five years experience and have worked in med/surg and long term care. I am seriously considering working per diem at a hospital and a long term care facility simultaneously. I do not need benefits at this time as I am covered under my husband's policy. Per diem positions appeal to me since the hourly rate is higher and there is the potential for more flexibility. I don't mind working second shift or picking up weekend shifts. I am a little nervous that there is no guarantee of a set number of shifts per week, but I think with some organization and planning ahead I can work enough shifts per month to make the bills. Just wondered if anyone has any advice on this topic.

Thanks!