Celebrants cost a lot less than most people spend on flowers. All work for a fixed fee, but may add on mileage if they have to come far.
You can contact them as many times as you want for no extra charge.
Reckon to pay from £150-220+ including travel, for which you ought to get ten or more hours’ work. The best are usually those who charge the most, of course, but there are superb celebrants out there who come cheap because they are committed to making themselves available to the less well-off.
At these rates, none of them is getting rich.
Most undertakers will expect to pay your celebrant’s fee on your behalf and invoice it as a third party payment (undertakers term it a disbursement).
You may prefer to pay your celebrant direct and of course you can do that.