I've been told once you get into a situation your brain just goes into autopilot. It's basic instinct.
Yep, this is basically it.
Good love, however, comes with experience. No-one could really tell you any 'tips', because often it comes down to the girl's preference. If it's your first time, the most simple position is missionary or cowgirl. Missionary is where the guy is on top, cowgirl is where the girl is on top.
Find a personal friend, someone who is close, who has done it before. You need someone you can relate to, preferably of the same love. If you can't find anyone, it doesn't really matter, the important part is you follow your instinct.
Don't be afraid to communicate during love, too. It helps make things less awkward and it can make it feel more personal and n'awwwww~~
If all else fails, stick it in her pooper.