Unless you're in for a crash course on tranny recplacement, don't worry about the torque converter and cooling lines, your mecahnic should do that stuff.
It can't really leak from too many spots, but you should at least find out if it's just a rubber cooling hose going to bottom of the radiator, a shaft seal, or worse. If the leak is something that can be replaced without tranny removal, then I would do that.
Since you've tried to fix the leak with a sealer, you will have to drain and refill three times. The sealer may be doing more damage to the tranny than just the leak was.
Honda ATF is dealer only. It's about $6-7 quart! You will need alittle less than three quarts for every drain and refill.
There's a drain plug on the passenger side bottom edge of the tranny. A 3/8 ratchet drive will fit in there. You may want a new aluminum crush washer for the drain plug also from the dealer.
Fill it back up through the dipstick as you have been. Us ethe correct proceedure to check the level and drive it for a week or so, then repeat.
I use Haynes manuals for my Hondas, they seem to cover most things. For anything else, there's always the forum.
After your first drain and refill, clean up the tranny area and see if you can't the leak.
Hopefully the money spent on drain and refills won't be just wasted, but t least you can try.