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I like an enema before anal. Just warm water used with something like this: link.
If it makes you more comfortable you can go ahead and do an enema, because it is important that you are comfortable if you're receiving anal sex.
I recommend "testing" first - go to the bathroom then take a lubed finger or lubed smaller toy and check it out. If you don't feel clean enough then you can use an enema. If you're clean and confident then go ahead to the buttplay.
The other potential benefit of an enema that I notice is that it loosens up the mucus in the rectum and I find that I don't have to stop and re-lube toys as much.
If you do an enema then only use warm water and keep it small - about a cup of water will work.
Also make sure that you have plenty of foreplay. Sometimes women find it nicer/easier if they've had an orgasm before trying anal.