I started working towards my PPL while studying for my MBA and holding down a full time job, not to mention starting our family.
If you have the motivation, it can be done. I would agree with Whirly absolutely about planning as a tool. However, plans are there as a guide and external influences will always require you to plan, monitor your performance against it and take corrective action (now there's a skill that pays off in the cockpit!). That doesn't invalidate the process. Planning encourages you to structure thinking about your activities - as you have started to do by asking the question.
I didn't get any spare time for TV and other time wasting activities though
HH