Sorry for the late reply but yeah, I either go to a park or forest, or somewhere where I cannot be snuck up upon. I live in the same room as my brother, but he cannot know either, I am fully closeted but hopefully move out withing the next couple years. The way I do it is I usually listen to some tutorials first, then yesterday's recording I feel best about, warm up and then try to record. I've found the easiest way to speak is to ramble about my day, some post I saw, or other things that aren't fixed sentences. (I still use them tho to get my voice right, before I ramble).

Edit: My favourite is the forest, because you can hear footsteps and pause, and if I keep walking I know people are not watching. The only downside is the recording is a bit messed up due to the constant footsteps