Don’t make a pronounced attempt at correctness of manners; don’t be vulgar, but don’t on the other hand, show that you are trying hard not to be vulgar. It is better to make a mistake than to be obviously struggling not to make them.
– Oliver Bell Bunce from Don’t: A Manual of Mistakes & Improprieties more or less prevalent in Conduct and Speech first published in 1884
Mr. Bunce’s point should be well taken. Mistakes are going to happen in social situations, trying hard will not prevent them. However, a bit of knowledge, practice and honesty will lesson their frequency and negative impact.