Anatomy is hard for everyone, except for a lucky few. For me, it took a lot of repitition and a few trusted sources to do well in gross. I'll list what I used for gross, but also make you do a search on sdn too. Before you know it, you'll also have a group of resources you can trust to help you through the course.
Gray's Anatomy is pretty good. Moore's is good and has some more clinical relevance. The book that I recommend, bar none, to supplement Gray's Anatomy is BRS Gross Anatomy Review. You can probably find it at your med school book store and also amazon. It breaks down the study of anatomy into regions just like grays. It condenses most important points into outline form, gives you some mnemonic devices, and has great clinical correlates. By far, the best thing about the book are the shelf style questions. Our written exams for anatomy were usmle/shelf style and the BRS book helped a lot since there were usually 50 questions after each chapter.
As for dissections, your school will probably provide videos of how to dissect. The University of Michigan has some high definition videos for cadaveric dissection you may want to google. It was great watching the video before starting the lab.
www.netanatomy.com was also a great resource to use when I did not feel like going into the cadavar lab.
If you have an iPhone, I recommend getting Netter's Flashcards for it. It features the ability to put it in "quiz mode" so the program on the iPhone will name a structure and you have to point to the correct structure. If given a choice between the box set of netter's flash cards and netter's atlas, I would choose the atlas. Reason being,
www.netanatomy.com also features a real cadaveric dissection quiz in every picture.
Finally,
www.medicalmnemonics.com is your friend as well. There's a ton of mnemonics here to help you memorize not only gross, but biochem, physio, etc.
Good luck, and don't forget to double glove... That embalming fluid penetrates everything...