In reply to FreeloaderJoe:
All the info (and links) you need here: https://snowdonia.gov.wales/visit/snowdon/parking-for-snowdon/ For winter Pen y Pass is back to first-come-first-served Pay & Display. I'd be wanting to get there before 8am. If it is wet or no snow, then later may be possible. Have a back-up plan of any other mountain in the area* in case it is full.
If you are coming from Garndolbenmaen you could park at the bottom of the Watkin path; get the S4 Sherpa bus from Nant Gwynant YHA up and down to Pen y Pass but there is only 1 bus up and 1 bus down as opposed to 6 up and 6 down if you were to use the S1 Sherpa bus from Nant Peris.
Taxis are expensive from Llanberis - £20 each way.
Not fancying madness of parking at Pen y Pass, or using a shuttle bus, plus recovering from an serious injury and the fact that the weather may not be desirable this weekend would send me elsewhere. like *Moel Siabod from Capel Curig.
Pob Lwc