I switched olive oil 1st Italian, then Spanish and now I use Greek.
I keep my nose closed from beginning to end. Do it over sink, rinse my mouth with water and spit it out and wipe my mouth with a tissue.. Melt a peppermint altoid in my mouth, open nose and does not taste anything.
Just make sure when you breath in between swallows that you keep your nose closed.
Shake the mixture hard in a glass jar till it is watery. I always use a little more juice than oil. Lemonjuice does not mix, so you can do that seperately.