His hoisted by one's own petard plan collapsed when the incriminating letters were leaked.

One can scratch one's own itch by writing a small utility that addresses a recurring annoyance.

When facing pressure from colleagues, one may choose to plough one's own furrow and pursue a different approach.

One can learn a great deal off one's own back by experimenting and practicing regularly.

When a person walks into the renovated gallery, it's hard to believe one's own eyes.

When people are tempted by flashy projects, it's usually wiser to keep to one's own knitting and build on existing strengths.

Sometimes it's wiser to attend to one's own knitting instead of getting involved in every dispute.

It's a good idea to tend to one's own knitting before offering advice to others.

It's often wiser to stick to one's own knitting rather than spread yourself too thin pursuing every new trend.

To chase one's own tail is to engage in a futile, repetitive activity that produces no real progress.