No need to worry about paying a mortgage as long as you keep your purchase at an appropriate level. You're already paying rent, so you are accustomed to making a monthly payment.
I always recommend not spending more than 25% of your take home pay on your monthly mortgage payment. Keep it to 15 year term with a fixed interest rate and at least 10% down. These "limitations" on the size of the house you buy will help to keep the amount of your purchase in line with your income. Many of my coaching clients that are in financial trouble often bought too much house for their income! Don't let the historically low rates tempt you to over purchase. And don't let the lender or real estate agent set your spending limit! Use the above parameters to set the limit and then stick to it.