Hi,
In LC Designer, there is a standard script in the Print button:
xfa.host.print(1, "0", (xfa.host.numPages -1).toString(), 0, 0, 0, 0, 0);
The second parameter tells Acrobat the start page and the third parameter sets the last page to be printed (both are based on a zero page numbering system). The help file sets out the different parameters.
In AcroForms the following should print:
this.print({nStart: 0, nEnd: 7, bShrinkToFit: true});
Good luck,
Niall