This is all an integrated system and different people react differently so it should be simply looked for what works and what doesn't.
That methods have been misused does not mean they are not of value.
And the placebo effect can also be used for healing purposes. The mind can be a helpful thing.
Things like breathing, muscle relaxing etc can be used to feel more at ease. This can imo be done without reaching too far into a body feeling. If you know you are breathing too fast and try to take a few deeper breaths, that might be a good start.
Some things are like a triggered response. So knowingly changing breath might take you to another road, where a more relaxed feeling might be possible.
Same goes for mental pictures. A place where you felt at ease, connected with the emotions there, might help.
If every day, a few minutes are taken out and used for some relaxing, without tv etc, this might be used for some kind of thinking...
there are a few meditation methods: one is to simply look what comes up, and deal with that mentally... what could be done etc..
the other is to purposely think about something, and see what solutions to that come up.
Not too long and not too much forced.
It might be advisable to have some kind of notepad ready.
You might ask your therapist what kind of meditation methods they would recommend.
Same goes for ideas that come up. Writers have for that purpose often a notepad ready, and write down ideas that flash up during the day, which might otherwise get lost.