gmail pasword

[ZeroTrace]

Hi, I'm new in this hacking thing and I want advice. The situation is the next one: I want access to an Instagram account that was hacked, but there is no way I can access this one and I tried everything, but they changed the recovery email. So my idea is to hack the new Gmail associated with the account, so I need advice where to start. I just need to get their password (I don't know how appropriate it is to ask this question).