What you can do, is have 90 minus the skill points you have available each level up, for me it's 15, so I have my repair skill at 75 at level 13.
Then when I hit 14, I put all 15 into repair, progress to the perk menu, select jury rigging. Then go back and change the skill point distribution to whatever you want, go forward to the perk screen and the perk will still be chosen even if you don't meet the requirement. Press okay and you still get the perk and the desired skill distribution for that level.
This helps you over leveling one skill early on, wasting skill books when the skill level is 100.
Just thought I'd share.