Pulmonary Rehabilitation - quality of program

I would like to know about the experience of others. Especially if they are on oxygen. Did they have a daily progress report? Were they taught breathing before exercise? Were they given a special exercise program designed for them?
I was interested in developing better breathing techniques since I am oxygen dependent for exertion and sleep, have pulmonary fibrosis and a little pulmonary hypertension and I have a cardiac stent. So I signed up for pulmonary rehabilitation
I am wondering how exactly PR should flow since my experience seems strange......I am having doubts about the quality of this program because of my experience on two visits.
1) For the evaluation, the person insisted on taking my blood pressure over a heavy bulky sweatshirt. She said as long as she could hear my pulse it was OK....I know that is not the recommended way to do it and I offered to slip my arm out, but she said no.
2) They told me my first time, someone would teach me the exercises. After there is a class.
I went and someone (not RRT) came, she had my file but did not take my O2 or blood pressure before or after. No progress report is posted on MyChart.
There were no instructions, no warmup exercises no cool down exercise after nor any information on breathing techniques before starting.
She just gave me oxygen tank set at my prescription of 2 L, put an oximeter on my finger, and put me on treadmill and told me to go as fast as I could. She waited for the oximeter to stabilize then walked away and came back 5 + min later and my O2 was under 88. So she said "guess we should bump it up" and she set it at 4L
After she asked me what I wanted to do weights or rowing etc. I did sitting, moving arms and feet - she went away for 5 min and then came back and said oh should lower O2 setting back to 2L
I asked two questions 1)I have pulmonary fibrosis with a stiff chest, should I take off my bra during exercise - she said we should ask the respiratory therapist when she gets back from vacation
2) since I am breathless when I bend over, I asked if I could even do the rowing machine since that would cut off my breathing....she did not know
I am wondering if I should stop going.