I had gastric bypass surgery and did everything alone. I live alone, no husband, no kids, no local family, and I didn't tell anyone other than healthcare providers that I was having surgery. I took a taxi to the hospital. Hospital policy does not allow taking taxis/rideshare or public transportation home, so I hired a home healthcare service to pick me up from the hospital (I was in for one night), take me home, and pick up my prescriptions. After that, I had no additional assistance.
The most limiting thing after surgery was not lifting more than 20 pounds for (I think) the first 6 weeks, and also not bending over, like when cleaning or doing laundry, so I had to be careful with household chores, but other than that, I didn't have any problems. I went back to work (desk job) after a week and I was fine.
I will say I had a very easy recovery with no immediate complications, but you won't know how your recovery will go until you get there. I would recommend to anyone without support to have a backup plan. Is there a friend or family member who could come if needed? Could you hire a home healthcare service if you needed help? Also, if there is any physical labor your normally do, like cleaning or landscaping, consider lining up someone to do that for a while.