First get a family you like, and save the game with them.
Then give them some skill points and when there mood bar starts to go down, just save the game again and delete them and keep doing this and pretty soon all their skills will be to maximum.
I reccommend that you have only two sims in your family so one can get all the skills and the other can keep on making more and more friends!!!
P.S.: To delete a sim, press 'shift + ctrl + c' and a box will appear on the top left corner of the screen and then type 'move_objects on'.
Then go to 'build mode' and have the hand tool, then pick up a sim with it, then press the delete button.
Theres loads more info this game, right here, with some cheats and tips, answers and The Sims walkthrough.
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