Right. Factory service manual for your model and year is an essential part of your tool box. Some shops will have these on the discount pile, so look there first.
Also useful (but not essential) is the HD Parts manual again for your model and year.
Finally, for your model and year, you might consider the electical system diagnostic manual (this is on the luxury side of needs). You will need something to tap into the computer for the trouble codes like Daytona Sensors Twin Scan II. Makes figuring out all that "spooky" stuff easier.
TQ