While their FAQ seemed great to me, I'm someone already familiar with why this is important and generally how to do it. I could see it being overwhelming to someone just considering the idea. https://forwardemail.net/en/faq#table-of-contents
Forward Email does a pretty good job with onboarding new users, in my opinion. Yes, some technical know-how is expected (you do need to know how to update DNS records for your domain, for example) but they give you step-by-step instructions both for setting up the MX and TXT records in DNS and for configuring your Google Mail account (or possible others, I didn't check) to allow sending email using your new address. I found it simpler to set up the forwarding itself than to go around to all my accounts and update the email addresses; that part is still a work in progress.
[0] https://medium.com/hackernoon/when-and-how-to-use-2019s-best...
There's so much nuance and it's easy to let things lapse, or make a small mistake and silently get all your mail rejected, lose/corrupt a bunch of data, etc.
I've not had any issues with email not reaching people - and I'm not sure that other mailservers would put gmail any higher, especially as they are used for a lot of spam
It's hard to know what's best in terms of risk management here. The likelihood that you will be hit is small but the consequences are potentially devastating.
[1] But my nightmare in here is that you lose access to your whole Google account and that would devastate me.
If I can set up a custom domain, you can definitely do so.
I'm a freelance and my livelihood also depends on cold emailiing people. It's just a false belief that we need Google to handle important aspects of our life. No, we don't
I feel free now.