I NEED YOUR HELP!!!!!!!!!

Every Saturday me and my friends get together and have a buy in. I read the "Harrington On Hold 'Em" book last summer. It really has been doing me well. It has really helped my game out. It has taught me many things such as observing your players which has really seperated me from the rest of my buddies at the table. It seems I always make second place to heads up play. But I always lose it there. Im not skilled at heads up and I always seem to have a chip lead and lose it. I haven't gotten a chance to read the 2nd volume to harrington on hold 'em which talks a lot about heads up. I have a poker game tonight. Do you guys have any tips for me? I'd appreciate it. Thanks.