Shwana, what part is giving you the most problem? Is it finding downloads, opening the files, or installing them in your game? I'll be happy to help, because I'm a downloading fool. But I need you to be more specific.
How do you know which ones won't ruin your game or mess things up? I like JM's stuff but scared to download it. Is it safe?
JM's stuff is well tested and well supported on his forum at http://www.variousimmers.net. Nothing is ever described as "safe" but JM's stuff carries much less risk than most things ... maybe it's cos he lives in a bunker.
If you are wanting to download things and are afraid of hidden hacks, then download "Clean Installer" from MTS2, unzip the files into a "quaranteen" file and have the clean installer check new downloads. Then drag the safe files into your regular download folder.