It won’t be as easy as you think. Tier 1 raids will be relatively simple with a crew of 12, less so with a crew of 6, but still doable dependent upon gear and skill. I’m assuming you’re attempting to 6-box it all by yourself using KA, but correct me if this is a poor assumption.
Shards Landing - Relatively simple, just need to make sure your MT isn’t getting blown up by barrels dropped from other characters standing around him.
Kael Drakkal - Also pretty straightforward, banish may be tricky but you may be able to just fight Dain at the banish destination.
Eastern Wastes - Should be an easy fight if you can work your way around the crystallization mechanic. Zerker decap is quite effective here.
Crystal Caverns - This one will require a fair amount of coordination across your characters. Assuming you can survive the orc barrel portion of the raid, the rest should be relatively straightforward.
Breeding Grounds - You’ll really want some strong ranged DPS to get your way through this one, but overall should be relatively easy as long as you coordinate getting your characters off the ground level quickly when the dragon takes flight.
Evantil - First portion should be simple, although may take a long time if you don’t have a Wizard / Mage / Necro to do some real fire damage. Boss should be straightforward as well, just be sure to dodge the mantraps.
Chapterhouse - This one sadly requires a lot of coordination as you’ll be moving in and out of shade form on characters. With enough healing and tanking, you may be able to take the shrouding at a slow pace and make this one relatively easy. Try to bring a few friends to help you out with this one if you can.
Grelleth - This should be the easiest one to just brute force your way though. Watch out for the Queen’s “change tank or get deathtouched” mechanic.
Valley of King Xorbb #1 - Here is where you might hit a wall. Need to balance the Mino / Goblin. If Goblin dies first, Mino can start hitting for up to 500k (can speak to this from experience). Similar problem if Mino dies first. Aggro is very hard / impossible to control. Also, one of your toons randomly gets banished and cant move or gets deathtouched unless you kill a slow moving spectre. Not entirely sure how you can beat this one without a LOT of brute force or 12+ characters.
Valley #2 - Very easy, just don’t use fire nukes or procs!
Valley #3 - Can brute force this one, just pay attention to emotes so that you don’t get your characters all charmed.
Chelsith - Should be an easy one to brute force.
Welcome to Plane of Shadow raid! Goodluck!