I understand... Believe me, I do! After all, I'm also a busy, married Father of 3 boys that are extremely active in basketball, tennis, soccer, school activities, church, and more. The fact is, if you want to build a successful shoe reselling business, you have to want it. If you REALLY want it, you have to find the time somewhere. When I was getting started, at night after the kids had gone to sleep, I would find online stores having sales, send the links over to my VA to research while I sleep, and then buy profitable shoe finds from her lists that next day at lunchtime or at the end of the day.
Its a repeatable process. Just build it into your daily routine and do it!