1.) Install Python 3.8, and make sure it is included to your PATH.
2.) In order to obtain an Google API Key (with YouTube Data API v3 activated) follow the Steps 1-3 here and then generate a key for the API. This key will later on go to the config file of the bot.
3.) Set up a discord bot, get the token and invite the bot to your server, by following this guide. The bot token will later on go to the config file of the bot.
4.) You need to enable developer mode in your discord client to obtain the channel ID's you want the feed to appear on. Do so by going to your User settings -> Appearance -> Tick "Developer Mode" in the ADVANCED tab.
5.) Obtain the channel ID(s) by right clicking the channel and then clicking "Copy ID".
6.) Obtain a user ID by right clicking the username and then clicking "Copy ID" (optional).
7.) Get the YouTube channel ID(s). This is done in 2 ways:
Visit the YouTube channel and then copy the channel from the URL, for example: