It's as simple as 1, 2, 3 and takes only a few minutes a day (once you get in to the habit).
1. List out everything you have to do - this is the scary part as you'll quickly realise you have too much on your plate and not enough time to get it ALL done. As you list them out - estimate how long you think each one will take.
2. Prioritise those tasks - what's important, what's urgent. What do you absolutely have to do, what do you need to do, what are the 'do them if I have time'? Use numbers, letters, colours if this helps you to prioritise.
3. Schedule the tasks in. This is the difficult part as you'll now see that in an average working day, the tasks and timings on your list are probably more than your working hours. (Schedule in your planning time to help it become a habit).
So start planning and see how much of a difference it makes.
Get in touch if you'd like to find out how to make simple planning work for you.