Let me tell you a story.
About two months ago, I brewed an imperial IPA. It was my first time using whole leaf hops as opposed to pellets. I tossed them in loose and realized too late that it would probably lead to some problems when it came time to transfer to the fermenter.
Sure enough, when I started siphoning, it clogged almost immediately. So, I figured that I'd use the funnel instead. It clogged as well. So, what's a homebrewer in a slightly inebriated state to do? Why, you stick your arm in the sanitizing bucket for 30 seconds and then reach into the clogged funnel, through about a half gallon of wort, and start poking the hops loose. It didn't work too well, so I had to get really aggressive with it. Eventually, I found that if I poured a bit into the funnel and then cleared it manually, eventually I'd get all the wort transferred. I figured that there was no way that I hadn't ruined my beer.
Two weeks in primary, another week dry-hopped in secondary, and then three weeks in bottles.... Results? Far and away the best beer I've ever made. On par with commercial brews like Pliny the Elder. I was so stoked that I gave away almost 1/4 of the batch, which was probably a mistake on my part.
Bottom-line. It is really hard to screw up a beer. That doesn't mean you shouldn't use good practices and learn to be sanitary, but when things go a little wrong during the brew session, you'll almost always be fine. Take tonight for instance. Great brew session up until the last hop addition, then the handle on the spray bottle broke off. Is life over? Is my batch going to wind up trashed? Should I switch to drinking Keystone Lite? Nope. Beer will be fine. Which reminds me...chill down is almost over, so it's time to go get ready to transfer to the fermenter.
It'll be fine.