Bathroom Fitters

I am trying to upgrade my CV.And would appreciate any advice on how to improve language, to be moreProfesinal
Basically, I have worked self-employed doing various jobs in corporate governance over 2 years, I will not list all the companies and the dates and functions, as most were the same thing over and over again. What do you think? I started working for a number of different companies, including a furnace cleaning company, landscapers, a builder a kitchen and bathroom installers. While working for these companies had to make their tax payments, accounting, data entry work, preparation and cost estimates and providing Pro / previous bills and final. I had to make reservations to visit the work so they could price up. I was also responsible for handling customer inquiries and complaints. How could make it more professional?
The use of "I had to" not good. Set aside "I had to" or redrafting. Something like, "In working for these companies I have done, tax payments, accounting, data entry work. I prepared a cost estimate and provided Pro / previous bills and final. I was also responsible for making reservations to visit the company posts work for them to give estimates. I also dealt with the investigations and customer complaints in a control base.
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