Tying a SPEED Nail Knot
First, form an overhand loop in the end of the monofilament material used for the butt-section of your leader. Next, place a toothpick or a nail in line with the fly line to support it, and place the loop next to the end of your fly line and then hold the loop and the line together with your left hand (if you're right handed). With your right hand wind the right side of the loop over the top of the fly line and the leader material and continue winding away from the end of the fly line approximately seven turns. Hold the wraps between the thumb and first finger of your left hand while you slowly pull the end of the leader with your right hand until the leader is in a straight line off to the right. Tighten and trim.
To turn this into an improved nail knot, strip the coating off about 3 inches of your fly line. Then tie a nail knot as described above over the fly line at the point you stripped the coating off, leaving the core material hanging freely. Carefully pull both ends of the nail knot, but do not tighten completely until you slide the knot down to the very end of your fly line. Then, tie an overhand knot in the core around the monofilament so that it seats itself right where it comes out of the fly line. Snug all the knots and cut off all the loose ends, and apply two or three coats of Knot-Sense to protect the connection. I've never had a failure, and I've used it on hundreds of 100-plus-pound fish.
Tying Bite Tippet to Fly
I prefer to use a simple three-turn clinch knot, but with heavier material you need to do several things. After measuring the right amount of line, I bring the tag end around three times and go back through the loop, then moisten the knot. This next step is extremely important: Fold a piece of paper towel approximately three times and then wrap it around the first finger of your right hand. Take as many turns of the 100-pound mono around your finger as you can, and put the first hook (if you're using a tandem rig) into a U-bolt or cleat. Hold the tag end perpendicular to the standing end as you start seating the knot. After the knot seats itself a bit, pull evenly with both hands until it's jammed tight. Holding the tag end to the side prevents the leader from kinking near the knot. If you can't make the knot seat firmly, use a dab of superglue to secure.