It is a bit awkward.
I like to book about a week ahead so that I know who I am seeing and can enjoy the anticipation and also I need time to organise my schedule to have that amount of time 'free' (2 hours - 30 minutes to get there, 60 mins booking, 30 mins to get home).
But I have had a couple of WLs ask me (politely) to please book the day before as they may have issues in the week preceding - such as sickness, accommodation issues, etc.
So now I text the day before, but have a 'back-up' plan in case they then say they are booked.
Not half as much fun as the anticipation !