That is expensive. Sounds like you are only getting the floor done as you said only the removal of the bowl and pedestal is required. This simplifies matters greatly as you don't have to worry about the water plumbing fixtures.
When we got our bathroom tiled (walls & floor) I removed all the ware, put down the plywood and refitted ware after tiling. Bit time consuming but not all all difficult. In your case it should be alot easier.
Basin Pedestal
1. Loosen screws on basin & cut any holding silicon
2. Gentley lift basin and pull out pedestal.
Toilet Bowl
1. Flush Toilet and tie up ball cork to stop it refilling again
2. Loosen waste pipe and remove bowl
3. Cover waste pipe with cling film !
Now measure and fit 7mm ply. You don't have to be very fussy with accuracy of cutting as the adhesive will fill in any gaps. Just make sure you screw it down well, screws 6-8 inches apart
To refit pedestal you may be lucky enough to get the pedestal under the basin even with the higher floor. If not then remove screws and lift basin while inserting pedestal. Rescrew basin to wall or a good coating of silicon would hold basin on its own to wall.
For bowl, remove cling film and position bowl in place and fit waste pipe. Mark position for holes in tiles. Remove bowl, drill and then screw in bowl.
It might be a good idea to measure position of original holes before applying plywood & tiles and use this as guide for new holes after tiling.
Not too difficult. Why not even take on the tiling? 3 square yards would be easy ! Save yourself some money and treat yourself to a nice pressie
Hope this helps,.
cybermate