Getting over nerves

so on a scale of 100 I'm about 40% on the experience level so fairly new to all this ( still finding myself ) but what're some tips and tricks you's use to get over the nervous or pent up feelings before Dates or hookups ? I've admitted bailed on a few hookups recently due to nerves and that's not fair to him so I was just looking for some tips or whatever you do to help with those feeling and actually showing up