Does anyone know how hard it might be to take apart an old lens to remove fungi?

I see a cheap lens on trademe that I could be interested in, not prepared to pay too much for it as I suspect it's a fairly risky proposition to try and take it apart for cleaning.

Anyone have any recomendations?

Link here: https://www.trademe.co.nz/a/marketplace/electronics-photography/camera-accessories/lenses/sony/listing/4751654976?bof=SdslLOn0