With a business plan beside you which you keep updated to factor in the ever changing business world, you will at least have a good grounding
for your business startup.
You do need to assess the risks. All those things that you don't really want to think about have to be brought to the forefront and assessed. If you manage to think of the majority of factors that could adversley affect your startup business - and then how you would handle them if they do happen - you will have a good risk management strategy that could save your business.
Again, you need to keep updatingyour risk strategy just as you update your business plan.
Risks change and knowing how you will deal with them if they happen can remove the worry that can be a major headache - especially for start up businesses.
Also think carefully about whether you should register as a limited company so that personal liability is reduced - take advice from a qualified professional!