I wear bifocals on a daily basis. Whenever I am doing lettering or hand sewing, I put a pair of readers on over the bifocals and while it looks silly - it is magical to have everything enlarged.
I have several pairs of readers that I wear over my glasses. The strength doesn't matter 2.0 is a good starter strength. I have some stronger ones, too. They are the inexpensive kind off the rack from a drug store.
If you are going to try readers over your regular glasses - choose a frame that is as wide as possible. The bows will hook over the top of your regular glasses and the nose piece will sit down lower on your nose. I prefer the all plastic frames to the ones with nose-pieces - but any kind work.
Pros - easy and inexpensive fix. Cons - you look silly - and people call you *six-eyes.*
I have seen people with the very fancy magnifiers that surgeons wear - and, of course, they love them - I'm sure they are wonderful to wear - but very expensive. For me - good lighting is essential - but, it would probably take a while to get used to wearing something on my head. I feel with the readers, it is very easy to slip them on and off - which is another advantage.