I have experience flashing large rigs and heavy machinery but haven't delved into tuning yet. Recently, I bought a 2006 5.9 Cummins where some work was done, including tuning and adjustable switches (though I can't remember which brands were used for the switches). However, I have some questions I can't seem to find the answers to.

Question 1: Flashing ECM with nexiq2
I’m currently using a heavy-duty insert with a nexiq2. The NEXIQ adapter works with the collections, and it has a Cummins Deutsch adapter. Can I use this to flash the ECM?

Question 2: Process for Flashing ECM
Is the process like this:
- Save PCM data using Insite
- Use EFI Live** to edit the file
- Save the file and flash it at the end?

I've always wanted to learn more about tuning but hesitated because I didn't want to experiment on customer vehicles or equipment. Since I own a diesel, I feel comfortable trying it on my own vehicle. Besides reading forums, are there any good articles, books, or videos that could help me learn more about diesel engine tuning?

Thanks for any help you can offer!