Procedure for Printing PDF Plans at original size in Acrobat (my be slightly different on different PCs):
1. Open the "File > Print..." dialog.
2. Click the "Properties" button.
3. In the "Options" tab select the "Convert colors to pure black" radio button.
4. Click "OK" to exit the Properties dialog.
5. Check the "Auto-Rotate and Center" and "Choose Paper Source by PDF page size" boxes.
6. Click "OK" to print.

Procedure for Printing PDF Plans at different size in Acrobat (my be slightly different on different PCs):
1-3. Same as above.
4. In the "Properties" dialog, in the "Paper Size" tab, select the paper size from the "Application Paper Size" drop-down menu.
5. Click "OK" to exit the Properties dialog.
6. Check the "Auto-Rotate and Center" box and uncheck the "Choose Paper Source by PDF page size" box.
7. In the "Paper Scaling" drop-down menu select "Fit to paper".
8. Click "OK" to print.