A lot of breath work is very specific to the individual. Guides, how-tos, videos can often make people more anxious because their body is behaving slightly differently than their "source".
Surprisingly, you don't need to learn it as much as you just need to do it and think about how your body feels as you do it.
When you exhale, just exhale like you were just relieved of something horrible... or like you're saying "whewwwwwwwwww" as in "whewww, that's a relief".
Don't worry about how many seconds it was, don't really count unless you like to, just breath and feel the feelings.
When you do that a few times, especially after a slow inhale... it starts to feel really good, really natural, and in a weird way when you think it's going to work and think it's going to feel good, it actually ends up feeling good and relieving stress.
This whole thread has a lot of info in it, but the main point is this - we suck at breathing, don't breathe properly and are remarkably easily knocked out the "calm awareness" mode.
It's sometimes best to work at this other way around, like with anger management, e.g. don't try to improve your breathing, but try to be more concious of when your breathing and mental state go to sh*.
Surprisingly, you don't need to learn it as much as you just need to do it and think about how your body feels as you do it.
When you exhale, just exhale like you were just relieved of something horrible... or like you're saying "whewwwwwwwwww" as in "whewww, that's a relief".
Don't worry about how many seconds it was, don't really count unless you like to, just breath and feel the feelings.
When you do that a few times, especially after a slow inhale... it starts to feel really good, really natural, and in a weird way when you think it's going to work and think it's going to feel good, it actually ends up feeling good and relieving stress.