Farm out some of these roles so you can focus on what you really do best. Then direct them, don't boss them. It's cheap insurance. It's a good will payment that's followed by progress payments, and a completion payment, covering you for the time and talent you're investing, just in case. Do what you say you'll do when you promised to do it.
Talent is important, but the world is overpopulated with failed geniuses who lived by excuses.
You'll beat the competition with conscientious follow-through and honest business practices. Your dependable reputation will make you successful in good times and bad. Don't be shy about letting prospects know who else has been delighted by your work. I was the branding facilitator for Sun Microsystem's Java Internet software in 1995, and by spreading their testimonial around I've been asked to name products for a number of other companies. Don't confuse creeping workaholism for motivation.