How do I replace a Delonghi DEM10 dehumidifier capacitor on the pcb?

Hi, I was very pleased to find a thread about non working compressors on DEM10's and replacing the capacitor may well be a possible solution, but as a novice in electronics could someone please explain the procedure once the board has been exposed? I believe that the capacitor has 2 pins which plug into the PCB but some contributors have also mentioned soldering. Must the old pins be desoldered on the reverse side of the board before the capacitor can be removed and the new ones soldered on? And is the spacing between the pins of the replacement capacitor critical to within 0.5mm as I haven't been able to source a new one of precisely the same size? Thanks for reading my query.