Never go into business without being prepared to be flexible. A mistake which occurs despite the best planning has to be overcome as quickly as possible. The wrong business location is not the end of the world. Every good business plan accounts in some way for disasters. Do not panic - think.
Relationships mean a lot.
Don't just buy from your suppliers. Get to know them. Look for opportunities for strategic partnerships. Janice offers heavy sales commission discounts to large corporations willing to distribute her literature to employees. Rosalind and her mother built such a close relationship with one supplier that when he decided to retire he offered Rosalind the company at a ridiculously low price.