I'm not sure what you mean by a "split grip handle". I'm assuming a cork handle with rings? Something like this....
If that's the case - it isn't tough at all. Rough up the area of the rod that the handle will cover with some sandpaper. Slide the handle down the rod (from the tip) and see if it will slide all the way down. If it's too small, take a rat tail file and make the hole bigger - I usually roll the handle on a flat surface with my right palm while using the left to work the file.
If the handle is too big, make two or three masking tape rings on the rod blank to fill the hole (wrap them as rings like the roll of tape leaving sections of the blank exposed - don't try to wrap the whole section with a layer of tape).
Once you know everything fits, mix some two part epoxy and apply it to the rod blank (the sanded area and the tape). Slide the handle down to the correct spot, then slide the winding check to go over the top of the handle (winding check is a little rubber ring that hides the hole).
Some kits come with a cork stopper, others with a cork cap. Either way, attach it and tape it in place with masking tape. Clean up your mess with paper towels and (I use) acetone.
Once everything dries (about 24 hours). Take the masking tape off the end. If it was a cap, then you're done. If it was a cork stopper, then use some sandpaper to trim it and make it look right.
Here's a link to the Cabela's kit...
If you are gluing the cork rings together one at a time, then it's basically the same process, only you will need to use sandpaper to form the handle to your liking and find a way to slip the steel rings over the cork.