Changing Transmission Fluid and filter...Difficult?

[David_Powell@hqlink.cbsi.com (David Powell)]

89 Audi 100
122,000 Mi

I now have friends telling me "they have heard.......<all kinds of terrible
things>....will happen if you change the transmission fluid in a car that has
high mileage and possibly has not had it's ATF changed in known history.  Those
same friends recommend I leave the existing ATF right where it is and don't
touch the transmission.  None of them own Audis.  Few of them are car mechanics.
 What should I do?

TIA,
DPowell