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I agree, - push the new pan connector onto the pan and measure very accurately the distance for to soil pipe and have it in position. Then nice if you feel it all hit hard as you push it in position.
I really don't like back to wall loos and prefer the type that nearly go back
I always use ridgid pan cons even on btw or close coupled closed backs. Measure twice etc and push pan con onto pan first and silicone spray pan con and inside of 4". Also as a tip, leave toilet seat til last then to check its pushed home fully i hold a torch over one of the toilet seat fixing holes and look down the other seat fixing hole. You can normally see the pan con through the holes.
And if you flush the cistern, you can even spy for leaks.
Just be warned - you will check it all fits and flush the cistern a few times, remove the pan, put some silicon down - re-fit the pan - exactly the same way as before- spy through the seat fixing holes to make sure you have a good connection, flush the cistern and water leaks everywhere.
Now you have water and wet silicon to deal with
As to oz-plumber comments about removing new pans for final silicone and refitting, - I think that is best avoided. You don't want the pan glued too well to floor. Fit the pan in place only once and if happy with it then flush it to check for leaks (use a bucket of water if no water supply yet) and then finally put a bead of silicone around the outside of pan base to floor tiles and work the silicone to a neat joint. That way you are not risking the pan having leaks after you have just freshly siliconed it all.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.