Take your time, get any needed certs. In your area, start small with maintenance and small repair work. Pick friends and family to design and install your first few systems on. Work out the kinks and remember there will always be a challenge, stick with it and you will be ok.
If you study your market and competitors in the area get they're pricing and do not undercut them. Some good points have been made so far, and some crappy ones too. Good luck.
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