have you done any hmi or scada program before ?
If yes, only with the help tool you should be able to figure it out without controling all the powerfull features.....It is a very user friedly soft
Siemens gives some starting class event if you need it and here we can ask the local supplier to give a training class for few peoples if you buy few Siemens parts in a year or gonna make it on near future.....
You can buy the soft with a starting package including full documentation, programming cables and an small HMI at a reasonable price (under the price of the hmi+cable alone)
The Siemens support web site can help you alot with any specific concern you may have also....
By the way make sure to install the lates service pack because the 2008 soft get a new approach from older version and without last SP you may experience some issues being not completely informed of programming error you did before downloading etc....