The first step is ALWAYS the hardest.
Also...what do you do when you see someone not fulfilling their potential?
I think the answer is, do nothing. Yeah, DO nothing, but say something. Express to that person how you see her/him. Express to that person how you see her/him and how it's different from where they are now.
For example, you could tell the person..."I see you as successful, able to be happy, able to be comfortable..." etc.
I think helping someone to actualize their potential is similar to helping someone quit cigarettes. You can't MAKE someone quit smoking, just like you can't MAKE someone actualize their potential. The person has to quit because they want to quit. They have to actualize because they want to....And this applies in all regards. From the person in the dead end job to the person in the dead end relationship, you can't MAKE anyone DO anything. You help people gain the confidence they need to act on their own. MAKING someone do something is hollow, and regardless what that person DOES, their achievement will be built on a foundation upon which YOU have built, and thus once you get tired of maintaining that foundation, the persons achievement will crumble and fall.
For example, if you MAKE someone quite smoking, that person will go right back to smoking as soon as you stop positively supporting them. In fact, it is unlikely you could make her/him do it in the first place.
Sometimes, a person needs you to help the start to build their foundation of change, but if you comprise too much of that persons foundation, as soon as you pull away, again, they'll crumble.
In fact, maybe it's best to simply help a person build their own foundation, a foundation comprised 100% of their desire to change/achieve/whatever...yeah, that's the most sure bet for lasting change.
So, the question becomes, how do you get someone to desire that process? Well, I think you just have to tell that person your vision of how they will look post change/achievement/transformation. If someone is jobless, you'd tell them that you can see them gainfully employed. If you know someone who is depressed, you tell them that you can see them happy. If you know someone who is without direction, you tell them that you can imagine them driving forth with laser like focus. If you know someone who is in a dead end relationship, you tell them you can see them in a relationship w/ the potential to grow into something beautiful and fulfilling.
And all these ends...I think it's most important to remember the following.
NEVER GIVE UP...Especially, never give up on yourself, never give up on family, and never give up on friends.
Random stuff...I know...I hope you could bear w/ all that.
Distilled: Tell people what you believe they CAN BE and what they CAN DO and let them use that positivity as the activation energy for them defining and then actualizing their own personal growth.
Boo yah!