Not sure about how hard it will be and it will depend on whether you are working for an employer or self-employed. If you are working for an employer and have wages slips etc to verify your income you can borrower to 90% of the properties value but you will have to pay mortgage insurance and this can be hefty!! This is an insurance to cover the bank for lending at above the usual 80% threshold if the property sells at a loss.
If you are self-employed and cannot verify your income with sufficient proof you will only be able to borrower a maximum of 80% but this will again attract mortgage insurance. If you don't pay the M.I. most lenders will only go to 60% in this situation.
I work for a bank so am only talking generally in relation to who I work for but believe it is the same for most lenders.
Hope this helps