The first step to becoming a homeowner is getting all your cards out on the table and being honest with how much you can afford.
There are several factors that will affect how much of a mortgage you can borrow. It depends on the debts that you carry, the amount of income that you have, and ultimately your downpayment.
Don't forget it's also about the property. If you are in love with a property that is a huge risk, the banks will be more hesitant to give you a mortgage.
Mortgage = the right client + the right property