hiya, im mobile and i give a reciept everytime. It just makes it so much easier for me to keep a record, obviously you have your diary to go on but of course there are times when the client decides to have more/less of your service so the price booked then adjusts.
I have a small cash book (can be bought from any stationers)
I put the date at the top of the page
then write down every treatment and price i took for it
or write retail and the item then price i took for it
total it all up at the end of the day
then in the back of the book i write the total for what i took each week, then i can see at a glance which week was good and which week was bad hth