How can I replace a bath tub with a handicap accessible shower?

My husband and I need to replace our tub with a handicap accessible ceramic tile walk in shower asap as he and I are having major health issues at the moment and it is not safe for us to get a shower anymore as he has already fell in the shower/tub a few weeks ago and hurt himself and I couldn't get him up by myself and had to call for help and it is all I can do to get a shower myself. I would like info on how to do this and if we could win the items to do this with would be great. Thanks for your help it is greatly appreciated!

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