idiot guide to upgrading itgate please

[pantomime horse]

can some one post an idiot friendly guide on how to upgrade once you have changed tuner to a sat tuner
ie what cables to use, what software to run, how to ftp files etc.
for those that know how it all seems simple.
for those only learning it is a total minefield
and one simple mistake can cause hours/days/weeks of frustration.
lets try and get everyone sorted
thanks in advance folks
andy