Is it necessary to understand math to be successful in RE?

One of the more confusing things for me with RE Investing is the math involved.  I understand I can plug all the numbers into a calculator to analyze a deal, but there are so many parts that need to be analyzed and considered, it's a little overwhelming.  How did you feel when you first started out?  Did you find it confusing too and do you feel this is just part of the natural learning curve?  Also- should I hold off on making my first deal until I feel completely confident with  all the numbers?