Using SimPE to Change Sim-DNA and Clone Sims. Very basic good information on how to use SimPE to clone sims, change DNA, stats and skills, and more.
Changing Visible Genetics Using SimPE. You need to know your way around SimPE for this, or read the above tutorial first. Use this tutorial to change a sim's visible genetics like skintone and eyes.
Using the Lot Debugger. Using the Lot Debugger from MATY to upgrade sims for Free Time and more.