First off, she an old girl, so be gently, don't force anything...
if the fore end does not come off by simply sliding on the button on the underside towards the receiver (I think), you've got problems as someone may have permanently fixed it on.
In order for the barrel to unscrew, the fore end first needs to be removed and then the lever must opened. An arrow on the underside of the barrel should show you which way the barrel you should turn. If the barrel doesn't want to turn, it too may have been fixed into place.
If this advice is useless, take the time to find a competent Savage gunsmith who is familiar with 1899/99.
Good luck.