Just look at dates to find the perfect time to start a Venus Square, it should be listed on a Friday (check every Friday for this year) with 'Venus Square' written underneath it.
Do the working during Waxing Moon, like for beauty or perfect skin or to get better at drawing, etc.
It's up to you.
If you are doing a working during a Wanning Moon tho, it's only for ending things during that time.
Think this through carefully.