I found climbing Ben Nevis from the Glen Nevis visitor carpark, very straight forward, and up until one actually reached the vast stone plateau of the mountain, there was nothing challenging about the climb.
The weather was kind, fairly mild for early October, no wind, and a little sunshine.
Having climbed the mountain, i can envisage the severity of the challenge, if the weather was unfavourable, particularly if it was windy.
There is no shelter whatsoever throughout the relentless slog, so i can imagine the climb up the tallest mountain in Britain, in poor weather, can be a serious undertaking.
Even though i was not really aware of the altitude i had gained , you simply knew you were on a much higher mountain than Snowdon.
My suggestion is to tick off Snowdon and Scafell Pike as quickly as possible, as within reason, they are very straight forward in bad weather, still a challenge, but due to their fairly low elevation, they pose little difficulties in poor weather, for a well equipped and dressed walker.
The moment i took my gloves off, on a totally calm Ben Nevis summit trig point, for a photo shot, it took ages for my hands to regain their temperature.
It stands to reason, Ben Nevis will pose the stiffest challenge, if your not blessed with a fine dry day.
As we all know, guaranteeing such weather, is a bit of a lottery, especially if your time off to climb the mountain is limited.