I do s&d's -- search & destroy where you just cut the split. I use a magnifying mirror and make sure there is plenty of light.
If my hair is curly from a wash n go, I find I have to twist the hair in sections to see the splits. I basically sit with the mirror in front of me and take a small section of hair and twist it all the way down. Then I look for splits along the length of the twist and cut those off about 1/8-1/4 of an inch above the split. Then I twist the other way, and do the same with any other splits I find.
If my hair is straight, I don't need to twist it to see the splits. I can just hold up small sections of hair and the splits stick out.
I am very careful to separate out the split hair and only cut one split at a time. Also, I only use the tips of very sharp hair scissors. With just using the tips I feel like I have more control/precision.
Also, I could only do this well once my hair in the back was long enough to pull forward so I could see it in the magnifying mirror.
HTH