My favorite method is quite scientific, it’s called needle in a hay stack. 
First I’d find the Note, then the Key. there’s only 12 notes how hard can that be right, 
Then it’s just play. Some of the fills are harder than others but it’s not too bad. I also have a keyboard on hand it makes things faster but I usually only do that when I’m hard pressed against time. I can read tab but not fast, some gigs with new peeps they’d hand me the tab and not notation sheets I’d just skip that and do it on my own. it’s faster for me.
You’d get better at finding keys and notes as you build up your ear training.
Well that’s the thing, if your ears are pretty good you’d hear it when you record yourself playing against the original. It’s nice to use bass isolation app like Moises but often times I find that doing it with the mix is easier as you can hear the chord harmonics. Some are not very clean and harder to transcribe but many are pretty straightforward.
This took me a few hours to transcribe but it took about a week to put it on paper/ App. the Tab inputting is killing me. It’s always been my goal to “Play like a Girl” but I’m not quite there yet
Here’s some fun tab for you. Can you play like a girl?