How fast do you want to become proficient at fly fishing? The instruction portion from a qualified instructor is really the least expensive and most worthwhile aspect of this sport. Instruction has the highest payoff and can get you up to speed much more quickly. 

Your instruction payoff is VERY HIGH because:

You don't waste money purchasing "things" that you really don't need;

You significantly  reduce your learning curve to become proficient;

Learning from  your "expert buddies" can, and often does, prolong the learning process.

You begin to look  and feel like a knowledgeable person with some fly fishing experience. What a way to impress your significant other -- or your fly fishing buddies!

Beyond getting fly fishing instruction, your dollar outlay could be very low if you stick to the basics; or, off-the-chart as you travel to exotic places, buy the best rods, invest in beautiful reels, and wear "the right stuff".  And maybe, even drive the "right" car (SUV).

Like any sport, fly fishing does require a personal commitment to try to learn as much as you can about the sport. Practice makes perfect!

Tiger Woods didn't just one day decide to become a championship level golfer; nor, did Jeff Gordon or Dale Earnhart Jr. decide that just because they learned how to drive their parent's car that they would instantly become NASCAR champions.

Become your own champion!