Implementing change to your stroke

It's very easy to get distracted from your focal points if you start doing endurance training whilst trying to make changes.
Ideally don't do any for a while whilst implementing the new changes and remain mindful all the time of what you are trying to do every swim.
If you're anything like me, you like to feel you've had a bit of a workout when you go swimming and to do some intervals or a longish steady swim.
I strongly advise people (and myself!) to make sure they start and finish their swims with 10 to 20 minutes of good mindful focal point swimming working with no more than three focal points per swim.  
Be patient and save the other areas you know you need to improve for another week or certainly another session.
As Mozart said: “The shortest way to do many things is to do only one thing at a time.”