I'm a biochemist/molecular biologist with less than optimal hand eye coordination and timing. Looks like I may have contaminated some media - which to be fair isn't exactly super cheap - the top of our big disposable pipette have cotton filters and it seems some cotton ended up in the bottles - I would swear that I always stop it far from the top but honestly it was probably me that did it. So I now have an antibiotic free media project, eg. I have keep a series of cells alive and regularly split them twice a week without antibiotics in the media and avoid contaminating them. Which is a bit weird, 95% of our media has antibiotics to avoid bacterial contamination - one person in our lab, much more senior and experienced than I does work under ABF conditions due to them messing with the specific virus she works with. That and a comment by my direct supervisor that most people get this right fairly quickly have me all bent out of shape. Logical me knows my boss is having me train under ABF because 1) once I can they can stop worrying about any potential contamination and 2) they've been wanting another ABF trained person anyway and this is killing two birds with one stone. Anxiety me on the other hand is blowing everything out of proportions, being paranoid that I'm being set up to fail or that if I fail this I'm going to get fired. I know that's almost certainly wrong, but anxiety is such a menace with how it distorts the reading of a situation - every happy face or exchange is neutral, neutral and below is bad, it's maddening.