I was using PT as my main DAW software from I guess around 1999~2000, so I can relate to the initial feeling of "hmm, how do I do this?".
Though I have to say, even though I was initially confused, it's hard to understand exactly why, when I look back! I mean, the input routing is all really obvious, the mixer is a mixer. Editing was a little weird, but it's not too different. The tools are pretty much the same. I guess it's the accumulation of small differences that initially can overwhelm.
I use a system with Logic 9, and a system with Logic X near every day, and on a basics level, the two are very similar... and also "feel" not that different from PT to me.