Lots of posts about Grintovec and Skuta on this site, so go to the Search trips option where there are detailed descriptions of both peaks with all options. Have water with you, it's summer and quite hot, there are other things you can leave out of the backpack due to weight
. Buy KSA map or download image from the web because the loop you plan suggests itself unless you want to avoid some secured parts if you have never done such a thing, and consider if this is your first alpine ascent this might be too much height difference if not done before. Good luck!