Idioms With DoSet 1

1My boyfriend's dad's a builder so the plan is that we ..... the flat ourselves.
2Can I ..... you a favor? I need a ride to the doctor's office tomorrow morning.
3It doesn't matter if you fail, just ..... your best.
4If you need to ask me any questions, please feel free to ......
5Sometimes, it's okay to just ..... and relax.