Hi Tan.
Same as what Marg said.
Before you bought your first IP, you must have done some rough calculations on what you could afford, how much repayments would be etc.
Go through the same process again and if the figures stack up, go from there.
What gets easier is the whole thing of dealing with agents, dealing with PM's, dealing with banks etc. This happens when you open your mind to possibilities.
Regards
Marty