It's kinda steep, but not insurmountable. If you have a doorway or a narrow hall you can put them between, that's probably best starting out. I didn't at the time, so I set up a chair on either side close enough to my handlebars that I could grab them quick if need be. Also, start with regular shoes, don't clip in. You will inevitably have issues until you finally get it, it's best to be able to get your feet down quick. Tip: The faster you get the wheels going, the more stable you will be. Ive found 20-25mph wheel speed to be about my sweet spot. Anything below 10mph is going to be squirmy as hell.

It's easiest to start out with one hand on your stable object (chair, wall, door frame, etc) and one on your bars. I feels really awkward at first, kinda like riding on ice. Spin up your wheels and then practice taking your hand off the object until you can ride with both hands on the bars. I've been riding rollers for about 2 years now and I still have them setup within arms reach of my workbench so I have something to grab onto in case of complete loss of focus. I would expect that you will ride off the rollers every now and then unless you get ones with bumpers or the parabolic ones, but it's really not that bad. Your wheels just stop, and if you get unclipped quick you will probably be just fine. I've never actually fallen due to riding off the rollers.

The major downside to rollers unless you do some modifications or spend some money is that you're not going to get a lot of resistance. I have aluminum rollers, so adding an array of magnets I was able to get mine up to about 600-700W max, but without that, I spin out at about 35mph pushing only about 250-300W.

The benefits, if you can do 10+ min without taking your hands off the bars on rollers, you will be holding laser straight lines out on the road. I've had times where I've spent a week on the rollers due to weather, gotten out on the road and it's like I have to make a conscious effort to change lines. The bike just feels amazingly stable when you have more than 18" of space to work with.