How to test the waters in my fairly conservative home?

By this do you mean to see how they would react? But not actually tell them?

 

Have they said anything that raised any red flags? Some conservatives are open to lgbtq stuff but not all. My dad is fairly conservative and he took it better than expected.

 

Do you have any LGBT classmates or teachers? Perhaps school assignments in the subject? You could mention this in passing conversation and see what their reaction is. Good luck.

 

Is testing the waters going to potential amaze your future? Will your parents cut you off financially? Will they have a negative reaction? Do you want to come out just to get the stress out of your mental state? The answers to these questions may help to some extent. Try to weigh the pros and cons of coming out.

I wish you luck.