We have a toilet which appears to be leaking from a pipe at the back. We're losing approx 6 litres of water a day (emptying jug frequently). Our home emergency cover won't repair it as we have two toilet therefore they've quoted us to get it repaired which we can't afford right now. Or I figured we might be able to repair it ourselves and the contents insurance will cover the ceiling etc being made good - we went away for the weekend, bathroom flooded and leaked through lounge ceiling 
How easy is it to DIY repair what should be a straight forward seal? Or are we better getting the plumber in and getting them to make sure it is the toilet and nowhere else?