Enema=A saline (or similar) solution that, chemically, causes you to flush yourself.
Douching=Pushing regular water inside and expelling it (and less desirable residue).
Enemas, if done regularly, can ruin your system, make you sick and otherwise mess you up for a few weeks. You can douche all the time, even multiple times a day without any consequences.
Personally, I used an enema once. Never again. It's not necessary.
(1). If you feel like you can go to the restroom, go the the restroom.
(2). In any event, then get one of those blue ear "bulbs" from a pharmacy, it costs about $2 dollars, and insert lukewarm water gentle inside. You don't need to lube the tip if you do it while sitting in the bathtub. For the larger bulbs, squeeze 2 to 3 (whatever you're comfortable with) bulbs worth of water inside, and then sit on the toilet and expel. If everything comes out fine, you're done. Sometimes you'll have to repeat this process 2 to as many as 4 times. Once you get the "all clean," soap and bathe/shower like normal and you're ready to go. I personally prefer to do this process 30 minutes to an hour before sex. Do not eat AFTER douching but before sex. As long as you don't eat, or feel 'movement' down there, you can douche and then have sex as many as 8 hours later.
It sounds gross, and to an extent it is. But you'll get faster at it, and once you realize the advantages (poop is abrasive and makes anal sense feel grating and unpleasurable for the bottom), you will never want to have sex without douching.