You will feel better immediately but you will have weaker hand strength for the rest of your life. It does not matter as you cannot use the strength in your hands now. Recovery takes several months but you will be so glad you had it done. To prevent pain in the future you need to stop doing the activity that caused the injury in the first place. In my case I had to get a new job. Having both hands done at the same time is not normal, I could never have done it. It's not just hygiene but everything you touch. Try not using your hands for a few hours.
Buy some latex kitchen gloves for showers and tape the end shut. Use wipes or antibacterial gel to clean your hands. Get some wet flushable wipes for the toilet. Stack pillows under your arms to keep your hands elevated when you sleep. You should get a prescrtion for hydrocodone, it causes constipation so eat your fiber and water.
EDIT: My surgery was the older open release style where they permanently sever the muscle above the tendon area, my lower palms form a v shape. This has a higher success rate but a much longer healing time than the orthoscopic surgery common now. I have no strength problems but that's what was explained to me prior to surgery.