2010 16v 1.6d drive remap

im looking to remap my 1.6d any advice? it has 125k miles and still runs super sweet with good power ive put nearly 6k on it since september and im looking to get slightly more power out of it with a stage 1 remap from somewhere like hdi tuning and i was just wondering beofre i go through with it if its a bad idea or not.