Your client's responsibility in terms of providing you with information and documents. A lot of disclaimer paragraphs. A fee inflation protection paragraph. A lawsuit or cost of collection protection paragraph. Provision for your client to pay you by credit card.
Litigation is a specialty, and divorce work a specialty within litigation.
As a general statement, specialties call for premium rates. Such is the case in divorce work. Again, what constitutes a premium rate varies by geography. It also varies based on the size of your firm, the amount of experience you have, the crowd with which you run, and even the depth of your staff. If you can blend the work at different levels, you can probably justify a higher rate for yourself.