I have a project that I am working on (to be posted in about a week) where I needed to enlarge a PDF pattern file. Have never done that before so I started out the very hard way. I would copy a section of the file, paste it into MS Publisher then draw some lines the right length and try to enlarge the pasted graphic to the size. Major problems were, time it took and the print were real fuzzy (pixel enlargement). Well after cutting the first several pieces I figured there had to be a better way.
Just a small amount of research lead this dumb brain to the real answer. With the PDF file on the screen and the section you want to enlarge, you select TOOLS, SNAPSHOT and then highlight he area you want. On my computer a screen pops up about the clipboard – just click OK. Not click FILE, Print. Make sure SELECTED GRAPHIC is selected. Now under SCALING first try CUSTOM SCALE and type in your scale enlargement. If you graphic does not fit on the preview page, change CUSTOM SCALE to TILE LARGE PAGES.
This process is going to save me a lot of time and worry. I hope it helps some of you, also.
-- Just learning the craft my Lord and Savior Jesus Christ practiced.