There's a name that I'd like to get for Minecraft as my name change. I don't want anyone else to 'snipe' the name by claiming it before me, so is there any way to change my name without that happening?
I can change my name right now and don't need to wait.
You can change your name here: https://account.mojang.com/me Once you change your name, no two people can have the same name at one time. It's yours until you change it again. If what you mean is that you want your OLD username to be secured, it is blacklisted for one month and a week, so you can change back, but after that point you can't secure it.
On https://account.mojang.com/me, there is an option to change your name. If you want to know if people have a username you want, you should probably head over to NameMC.