Product review (5 stars): Homeowner can do this, get the tool.
Took 2 hours to remove the old and put the new, using the tool.  The old had so many tears and so moldy, yuck!  We did the tub wash before and after.  Be sure to double glove cause it is nasty.  I keep the doors open after all washing.  But was not doing the tub clean with the tablet as often as it says.  I advise changing the front gasket every few years.  We did not do that internal gasket yet.  This LG is 7.5 years old, not sure how long it is planning to keep running.  So far it has been great.  We took pictures as we opened the washer up.  Never had to use them, but maybe it helped the memory.