“If something is worth doing, it is worth doing well” is a common english language phrase.
However, it is a very dangerous idea.
Perfection is the enemy of progress.
If something is worth doing, it is simply that – it is worth doing. If you start with little experience, you will probably do it poorly – but only by doing it poorly will you learn to do it better – and one day, you will do it well. The only way to do the important, challenging things well is to first do them poorly.
Wendy Ulrich, HR guru says “If something is worth doing, it is worth doing badly.”
Start now while you are still imperfect. Don’t wait.
Post Script: There is obviously a segment of things that should never be done badly: nuclear fuel rod replacement, deep sea oil drilling, scaffolding for building works – but for the majority of us the important things can start with a low level of quality, perhaps in a safe environment. If you write a draft, you can improve if with several rounds of edits. If you want to play piano, you start poorly. Your first big speech will not be as great as your 100th big speech.