Don't get in that habit. As nurses, we do a lot of things that we just shouldn't because it's easier. Even though I "know" what meds I'm giving to my patient, even it's just one, I try always to bring the MAR with me to the Pyxis and bedside. Get in the habit of doing that, and it will become so second nature, that it will become one less thing for you to worry about.
It sounds like you're just frustrated with being new. Take a few deep breaths and pat yourself on the back.
You're open to suggestion, and that's one of the best things you can do as a nurse -- experience, intermediate, and new, alike!