Heh, I'm back. After 8 months it seems. If I wanted to be funny I'd say I'm using Internet Explorer, but...
ANYWAY! Update after 8 months (not that anyone cares anymore, haha!). I actually died in Mass Effect 1 in a random planet, took a rocket to the face from a cerberus trooper.
I got so mad (I didn't even record it because I thought it'd be an easy fight), so I just stopped and gave up... After spending 15+ hours on that particular playthrough and have it all go away in a single rocket... Devastating... :/ So I took a break from ME.
Recently I've been playing other games with similar Dead is Dead rules, notably Skyrim on Legendary, which has gone very well. However, I feel like I have to finish this ME challange... It haunts me! So I'm going to restart my ME playthrough soon enough. With an Engineer, of course.
I feel like any class with Biotics/immunity would make it too easy, atleast in ME1. My teammates are going to be Tali and Ashley (or Garrus), so I'll have no biotics for the ultimate challange.
Also if I would make it through ME1 I would change my class to be the worst of the next game. I think that the worst class of ME2 (for dead is dead rules) is the Vanguard, because of their high risk and high reward playstyle. ME3 has very balanced classes, as far as I remember, but I think the community thinks that the Soldier is the worst. So we'll see.
Also, my friends said that I should record EVERYTHING (make it a let's play), so that it'd be certain I don't cheat (aka I film a fight over and over again until I beat it, and just pretend it was on the first try). I'm not sure about this since I'm a really "slow" gamer, as I check all the investigation options in Conversations and read the Codexes, and with my Dead is Dead rules I look at stats for a long time AND my inventory screen... Wouldn't be very exciting for the watchers... And I also play RPG's to 100% completion, ALWAYS.
But we'll see! I know for sure I'm going to restart my playthrough soon enough!
Thanks for all who have commented and given suggestions, I really do appreciate it.