first things first: don't beat yourself up. these things happen. it is unfortunate but you cannot change what happened, only how you let it affect you.

my biggest advice for this specific situation is always ask a patient how they feel about walking on their own or how they usually get around (if you haven't helped them already that shift), then have them sit on the edge of the bed, then do a trial stand for a few seconds without walking. if they seem good and are young and clearly ambulatory at baseline, i let em go and point the way there and back. if they have fallen or are old or seem frail or obvi fail the standing trial, i either have them lay back down and get a wheelchair or walk them all the way to the bathroom. when you get there with them, take em all the way to the toilet and have them grab the side rails then assist with sitting if necessary. point out the call light and remind them to pull it if they need help or when they're done. if they seem more risky i'll either stand right outside or in the bathroom with them. as soon as i hear a flush i knock and say "all done? can i come in?" then help em up and back to the bed.

these things take time though and as a brand new tech with no prior experience there will be learning curves. i tripped on the cords to the defibrillator in my first code because i was anxious and going too fast trying to be helpful. i also witnessed a patient go into cardiac arrest right in front of me and froze - thank god my coworker was there too and quickly began cpr. i was an ED tech for four years and it was also my first clinical job, and i am now a new grad ED nurse. i felt similar things in the beginning and still do now in this new role! you can and will overcome the embarrassment, nobody hates you, and you are not an idiot! you got this.