To make it simple...
1) Nail knot a short butt to fly line and tie a perfection knot or have the shop do it
2) tie a perfection knot in the butt of a tapered leader, loop to the short butt on the flyline
3) replace the tippet as needed using a blood knot or a surgeons knot
For really big bugs, cut off the tippet and put it in your pocket. Tie the fly to the leader. To go back to the wooly bugger, blood knot the tippet back on.
BTW - smallies on a fly ROCK!
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum