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I know what you mean about the invisible thing, I had that for a long time before needing my stick. I guess I notice quite a bit, one of those annoying people who likes to help people :)
I know that some people with disabilities don't help themselves, I did a lot of volunteering when I was younger at a centre for the severely disabled and hospice work and some people give disabled people generally a bad name, it's just a shame the few put people off helping people generally.
I guess I'm quite conscious of being considerate myself, making sure I don't get in the way as much as I can and still looking out for other people etc... and I do do things to help myself, I avoid rush hour wherever possible, tend to be in work before 7am and finish earlier so it's quieter and less hassle getting a seat or crushes to get on, being jossled etc... have changed my routines, all kinds of things.
I am rubbish at being assertive though I will ask if I need help sometimes (though not easily, I like to a least try though sometimes I tend to overdo it rather than ask).
If I was on go slow and was aware of someone behind me where it was difficult to pass I'd have stepped in and let them through though, if I was the person behind I'd have just slowly followed if I had time or politely asked if I could get past.