Русско-английский словарь пословиц и поговорок
АВОСЬ ДА НЕБОСЬ ХОТЬ ВОВСЕ БРОСЬ
If you do some job, do it properly; if not, do not do it
Cf:/Be the labor great or small,/ do it well or not at all (Am.). Do it right or not at all (Br.). If a thing is worth doing, it is worth doing well (Am.,Br.)