You live in Poky? I'm so sorry...
(I jest. Boiseian here)
But seriously though, take these tips to heart:
-Before entering, swap 3 stamina parts for 3 hearts at the statue by your house. You don't need 3 full wheels for the trials, but 3 extra hearts can make a difference.
-Before entering, set your sensor to detect treasure chests. They will let you know if there's a chest in a particular room.
-Before entering, cook 4x Ironshrooms and 1x Dragon horn for a meal that grants triple defense for 30 minutes. Eat it right before starting the trial and the buff will carry over into the trial. That should protect you from major damage throughout the first two trials and until the ice phase in the expert trials when you'll have to replace it with a warming effect.
-At every break area, carefully grab the fairies while squatting, then go and collect everything else. If an area has Hearty ingredients, cook them individually for a meal that restores full hearts.
-Conserve fire weapons for the ice phase, ice weapons for the fire phase. Remember that fire/ice arrows will insta-kill the opposite type of Lizalfos and can heat up/cool down Taluses so you can climb on them and spin-to-win.
-You should end up with a total of 9 ancient arrows in the expert trials. Use these on every Lynel and Guardian you come across EXCEPT the floor with the 6 buried guardians (just hide behind large trees and pick those ones off with regular arrows). If done correctly you'll use 8 ancient arrows with one to spare. Also, use Stasis+ on those enemies to ensure a clean shot.
-Conserve your bomb arrows if you can, and use them on the charging mounted Bokoblins in the last level. They will make your life so much easier.
Other than that, just relax and take your time. It honestly isn't as hard as you think it is. I was really nervous about it and got utterly demolished on the beginner trials because I didn't think ahead and I was so tense about surviving each individual floor. But once I took all the necessary precautions and I knew what I was up against, the middle and expert trials were piss easy. I finished the expert trials with 3 or 4 fairies, a BUNCH of hearty meals, and a bunch of good weapons. Nowhere close to scraping by. They really throw a lot of useful stuff at you in the later trials.
Main objective is efficiency; life is inefficient; life hinders the main objective; life must be eliminated.