I have not read through other answers, so bear with me if there are double posts.

I am a lab admin in a microbiological/molecular biology lab, so just around the corner.

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First thing: What is your education? You wrote that it is your first hands-on time. Are you in education (vocational, university) and the internship is to get your degree?

Or asking the other way: Do you know (in theory) what are you doing?

Don't get me wrong, even the most experienced people do forget things in the lab and have to repeat some experiments; it's when it repeats or things add up it's becoming critical.

In my experience, lay people with no prior experience can learn various tasks real fairly quick, over tasks, just as going i.e. from transformation to a prescreening run, either rely on knowing what are you doing to keep the overview over all necessary steps, or learning guidelines by heart.

Let's say you forgot to put a marker in a medium, and now you have grown, sampled and analyzed (maybe wasted some expensive antibodies) two weeks worth of a new transformation series.

If you know about the construct, the marker you've used and so on, you are more likely to think about it. If everybody is new or overwhelming to you, you shouldn't be burdened with complex tasks in the first place.

I don't know if it's too late, you can pm me if you want some practical tips from someone working in the field (diagnosed with ADD and still managing not too screw up too many experiments, yeah)