Sharpening by hand with no guides is a skill, no doubt about it. But... once you "get it", no blade is safe! None will be too large or too small, you will scoff at heavily recurved blades, and you will discover you can sharpen confidently on all kinds of different materials.
About 40 years ago I was working for a company that built fast food restaurants. I charged many a beer for putting edges on knives using sandpaper! Think about it; start with 180 grit, move to 220gr, then 320, then 600. That did it for most. But for hunting knives I would finish with 1000gr wet,/dry paper that put a shaving edge on some of the knives. (1000gr meant extra suds...!)
Take the knives you have get to work on it. Some folks get the hang of hand sharpening pretty easily but most won't put the time in yo develop the skill. Good luck!
Robert