Split grade printing in a nutshell:
Use variable contrast paper. Insert the low contrast filtration filtration (grade 0). Do a test strip of the print evaluating only the high values (light tones). Choose the exposure time that yields the faintest detail in the important high values. Sometimes I pick the strip that is 1/6 stop lighter than the one that looks right because my inherent tendency is to print too dark.
Then make a second test strip. Expose the paper with the grade 0 filtration for the time determined in the first test strip. Then change the filtration to grade 5 and do a test strip on top of the grade 0 exposure. Here you are looking to get the low values (dark tones) at the proper density.
When you do the test strips, you can get a feel for dodging and burning times at each grade. For example, the bright domes on the print will probably need dodging during the grade 0 exposure, but not much in the grade 5 exposure or else they will look muddy because the black bits will be gray.
To learn the process, I think full sheet test strips are very helpful to get a feel for what you are doing. After awhile though, you can target smaller test strips for the important high values and likewise for the shadows. For example, if I am making a 20x24 print, I often cut the paper into 4 inch slices and do test strips across the appropriate areas of the print to save paper. For 8x10 size, paper is relatively cheap and you will learn much more by using full sheets. In the end, it is cheaper than making lousy prints.
Bleaching in a nutshell:
For bleaching, you use a solution of potassium ferricyanide. I can't remember the dilutions off hand. But you buy a pound of "pot ferri" from Photographer's Formulary for $15-20 and it will last a lifetime. You mix up a concentrated stock solution to keep on hand. The bleach will lighten the already light areas of the print disproportionately more than the dark areas. So if you have a print with proper shadows but muddy highlights you can immerse a fixed print in a dilute bleach solution to give it more snap. However, it is easy to over do the bleaching as the process continues briefly after you remove the print from bleach and put it back in the fixer. Also, you can use a more concentrated bleach solution on a cotton swab and bleach selected areas of the print. Place the wet, fixed print on a sheet of plexiglass at an angle in bright viewing light. Apply the bleached swab to the selected print area and keep a constant stream of water running over the area so that you don't over bleach. Be mindful of varying the direction of the water stream so that areas downstream of the bleaching area are not bleached inadvertantly. You want to apply several coats of bleach so that the process is gradual but use concentrated bleach so that the process does not take forever.
Recommendations vary, but I mix the beach with fixer rather than straight water. After bleaching, re-fix, PermaWash, and was as usual. If I know I am going to bleach a print, I will often make several copies, batch process them, and then beach the wet prints one by one. It takes some practice to do well and I am not yet that good at it.
Bleaching would be a good topic for one of the JBrunner videos.