How do I do it? Well, I imagine who is the best and worst at each thing and try to rank my characters next to them. Below is the Skill-O-Metre ranks for each skill, with famous canon charaters as a guideline. My apologies to Jar Jar.

Alignment
Palpatine	0	1	2	3	4	5	6	Malevolent
	0	1	2	3	4	5	6	Corrupt
	0	1	2	3	4	5	6	Anarchic
	0	1	2	3	4	5	6	Neutral
	0	1	2	3	4	5	6	Amicable
	0	1	2	3	4	5	6	Virtuous
Leia Organa	0	1	2	3	4	5	6	Altruistic

Force Power
Jar Jar Binks	0	1	2	3	4	5	6	None
	0	1	2	3	4	5	6	Initiate
	0	1	2	3	4	5	6	Novice
	0	1	2	3	4	5	6	Intermediate
	0	1	2	3	4	5	6	Adept
	0	1	2	3	4	5	6	Expert
Yoda	0	1	2	3	4	5	6	Demigod

Lightsaber Skill
Jar Jar Binks	0	1	2	3	4	5	6	None
	0	1	2	3	4	5	6	Initiate
	0	1	2	3	4	5	6	Novice
	0	1	2	3	4	5	6	Competent
	0	1	2	3	4	5	6	Accomplished
	0	1	2	3	4	5	6	Masterly
Yoda	0	1	2	3	4	5	6	Inimitable

Weapon Skill
Jar Jar Binks	0	1	2	3	4	5	6	None
	0	1	2	3	4	5	6	Limited
	0	1	2	3	4	5	6	Amateur
	0	1	2	3	4	5	6	Moderate
	0	1	2	3	4	5	6	Varied
	0	1	2	3	4	5	6	Proficient
Han Solo	0	1	2	3	4	5	6	Superlative

Piloting Skill
Jar Jar Binks	0	1	2	3	4	5	6	None
	0	1	2	3	4	5	6	Trainee
	0	1	2	3	4	5	6	Basic
	0	1	2	3	4	5	6	Average
	0	1	2	3	4	5	6	Advanced
	0	1	2	3	4	5	6	Ace
Wedge Antilles	0	1	2	3	4	5	6	Veteran

Computer Skill
	0	1	2	3	4	5	6	None
	0	1	2	3	4	5	6	Minimal
	0	1	2	3	4	5	6	Basic
	0	1	2	3	4	5	6	Average
	0	1	2	3	4	5	6	Experienced
	0	1	2	3	4	5	6	Genius
R2-D2	0	1	2	3	4	5	6	Uber