If you are wary of a stanley blade type scraper, especially if you have not used before, you could try a plastic scraper. We use these in the first instance all the time and they shift the vast majority of paint spots. If no joy then either a metal bladed wall paper type scraper or the stanley blade scraper.
Whichever you use be careful as they all have the potential to scratch if used incorrectly.
We buy our plastic scrapers from Wilkos. They sell as a pack of three different sizes for around 70p. Well worth buying a few packs as they always come in useful.