advice reallyyyy needed

Sooo I have had this FAT crush on this guy for about the past year. I think we are really starting to get somewhere but I keep holding myself back because I'm nervous that we actually will "get somewhere". I've sucked dick before but I know I'm not very good at it so I'm nervous to suck his. Plus he is older and has had girlfriends before so I know he has experience. So if you have any tips pleaseeeeee comment.