I wouldn't worry about overdoing it. Just start. You can always recover before the next one. My first long ride was 80 miles on 81" wearing denim hotpants in the height of summer with no water bottle.
To be honest I agree with all you guys talking about fit, hydration and food and stuff, but my first long ride was something like the one above, 75 miles on a Halfords full-suss mountain bike that cost £150 brand new.
To be honest I agree with all you guys talking about fit, hydration and food and stuff, but my first long ride was something like the one above, 75 miles on a Halfords full-suss mountain bike that cost £150 brand new.