So much this. Don't rely on just not using company time or resources. Be open and honest. Get it in writing. If they won't give it to you, there's no chance of

So much this. Don't rely on just not using company time or resources. Be open and honest. Get it in writing. If they won't give it to you, there's no chance of them being ok with it just because it's not on company time or resources. Know the boundaries before committing. Then you and your employer can keep a trustful and productive relationship while you try things out.