Instructions
Determine what game and version number of the Sims 2 you are using. Have this information handy before going online to look for modification software.
Search the web for Sims 2 modifications. Check the website for good construction and see if there are any user comments to check for satisfaction statements from users.
Decide what kind of modification you want for your Sims. Explore some of the more simple downloads like clothing and hair mods first to get a feel for what the options are.
Always check the download for the version number and if it is exclusive for the Sims 2 or what specific expansion is needed. Always look for explicit directions on installing the game modification.
Check the website to ensure that no payment must be made before downloading the modification. If you must pay, then keep searching. Some websites will ask for donations which should be totally voluntary. Always save your current game to a separate location before modifying the game files in case of corruption.