Although I grant that doing anything exactly like Brion Toss recommends is the best course of action in most cases, and that his equipment is great, I just have to put a plug in for being primitive. I have now done a lot of eye splicing with double braid, including making dock lines, halyards, and traveler lines of all different sizes, and I have done all of it without the use of fids.
I watched the Brion Toss video which I highly recommend, read everything here, and searched google elsewhere until I found some great instructions that do not involve the use of fids. I was successful on my first try with a nice, tight and solid splice. By the way, the easiest and thus best measure of how much tail to bury is this: Take the diameter of the line, say 3/8, and convert to 16ths, so 6/16ths, and then divide the numerator in half and add it to itself, so 6 + 3 = 9 inches to bury. This is super simple math and way easier than multiplying anything by 22 or whatever in the other methods.
In the method I use, you use a simple Philips screwdriver and really just tape up the ends of the line to guide it through. It has always worked great, doesn't take long and no special tools.
Here is a link to where I learned this method. Thanks to them.
Double Braid Eye Splice
Maybe this method will work for someone else out there as well as it has worked for me.
Happy New Year everyone.