NOW here's a challenge ... Can you tie a tie on another person WITHOUT a mirror?
I don't use a mirror, but tying another person's tie is like trying to write backwards.
I usually use a (full) windsor knot, which is easy to tie once you've done it a few times.
It keeps a neat shape and is easily adjustable.
Unfortunately, it means my friends expect me to be able to tie it for them and think I must be trying to make them look stupid when it comes out a mess. You need to tie them tight and it's hard to do that with your hand around someone else's neck, using the wrong hands and the wrong perspective.
It's usually easier to tie it on myself, then loosen it, take it off and give it to them.
Four-in-hand reminds me of school and makes people look like schoolboys reluctantly being made to wear a tie. Half-windor's okay, but no easier than a full windsor. Both of them go lopsided if you tighten/adjust them badly, while the full windsor keeps a symmetrical shape no matter how much you re-adjust it.
I've occasionally done a fancier knot for a wedding or something, like the trinity knot:
That definitely took a few goes to get right.
The care I put into tying a tie increased significantly after I switched to a job where I
didn't have to wear one.