Buy a bookcase and click on it, choose the "study" option and then mechanical, once your Sim has a few points you can have them earn more by fixing things if they break down, if they don't have a decent amount of skill points call a repair man instead, other wise the Sim will end up getting electrocuted.
click the book case and click study then click mechanical then wait
Buy a bookcase. Click on it, and press "study.../Mechanical". Do this (while fulfilling Needs and Wants) until your sim has Mechanical 2.
Anywhere.... usually in the hotell or in the restaurant place.
mostly by building stuff and starting fires.
try when the sink or shower brakes down:)
you have to find them at certain spots at certain times of the day.
Once you get 5 mechanical skill points you have to complete the mission "Earn Mechanical 5, break into the Penthouse, and steal the Blueprints" and when you obtain the blueprints for the antenna you have to take it to the alien emperor: Emperor Zizzle.
I don't know why. That doesn't happen to me very often but if it does, I either make a sim with high mechanical skill fix it OR I call the repairman.
You can either build a sturdy bed or create tools or build a bench or create a raft or bridge
Cooking, Fishing, Mechanical and Gardening Skill
Skill points are found in different places, at different times of the day. There is no telling where they will turn up. for more information, go to IGN.com and look for The Sims 2 walkthrough, skill points calender.
i think you just have to look around, i heard that there is a cheat to make your skill points increase or decrease but you will have to look around on the internet for that. Hope that helped.