If you want dm here is two tips. 1. Be honest that you lack experience. There is few dm compare to how many players there is that wants to play. That there is tons of understanding and patience as they are just happy to finally play.

If you really unsure try find dms that wants to play. They often know how “difficult” it is in the start out and often really starved on being a player and dying to play.

Go for one shots like The Lost Mine of Phandelver. Great prewritten adventure that takes like 4 sessions(you could go like one part if you really unsure). If it is awful then you never have to see them after that.

If it went okay you can do same one again and this time it will go much better.

If you loved it and you group you can often continue. If you absolutely hated it then you never have to dm again but now you know that.