Moving a Toilet - more trouble than it's worth?

[StumpedCanary]

Need to revamp my bathroom and am thinking of putting the toilet where the bidet used to be (where a washing machine is currently plumbed in). I understand that the "sump pipe?" will need to be widened? Good workmen around here are short in supply it seems (or I just never find them), is this a fairly standard thing to do or am I likely to create myself a stack of future problems?
The floor is tiled on either concrete or brieze blocks, I live above someone so guess pipes must travel down the wall (the apartment below is inset under mine), or under and down. Not sure how this might affect anything.
One guy's told me it's a major job and another has said it's fairly straight forward - not sure what to believe... is one lazy and the other over confident, or... please advise!

 

[RigidRaider]

In a typical Spanish apartment building you may have concrete floors, which will have steel reinforcing rods in the concrete so to cut a new hole for the soil pipe may turn out to be a major operation. If the floor is blocks set between beams it might be easier, as long as the beams actually line up each side of where you want the new soil pipe.

 

[StumpedCanary]

oh poo. Will ask the complex manager if he knows anything. Cheers!