To succeed you have to set goals you believe in and be able to motivate yourself to reach them. Define your own idea of success. It's personal and different for everyone. Your own negativity is your worst enemy with naysayers ranking a close second. You will make mistakes so get over ALL of them now.
Mistakes are nothing more than a learning opportunity.
Negative publicity works faster and lasts longer. Hire professionals to handle the areas of business you do not understand, especially in accounting. The IRS will appreciate it. Develop a marketing plan that uses a variety of techniques and stick with it even when business is booming. Every time you hand out a business card, send a letter or leave behind a brochure make sure it presents a professional image.