I am changing out the trim on my Hessco Passport Ensemble tub. I would like to order the parts from uspartscenter.com, but before I do I need to know a few things. Do the parts come with instructions on how to change out them out? Are any special tools needed to do the job? Do you have to lift out the tub or are you able to do it from the inside of the tub? Any help on this would be greatly appreciated