Yes there are many different sights available. Yes it is a diy project. It will take much much longer to decide what you want than it takes to change them. I suggest fiber optic sights but you will want to look and make your own choice. Try Brownells or midwayusa they both have many choices and are both excellent companies.
Just walking on the edge of of my grave.
I really like Skinner aperture peep sights. I have them on my Marlin 336. I just bought a standard 10/22. I'm not going to be buying a receiver-mounted peep sight, though. I'll be installing Skinner's barrel-mounted peep sights.