is defined as the resistance of any physical object to a change in its state of motion. In a context familiar to us, we usually oversimplify it and term it as laziness at times and 'lack of initiative/spark' at other times.

While inertia encompasses both of the above qualities it qualifies them as a mixture of your attitude and aptitude. Accordingly there are two stages in which inertia kicks in.

1. When the task/initiative/activity is completely new and totally different from what you have been doing/flowing with for the entire while
2. The 'once bitten twice shy' condition. 

Ever felt the jitters when at work, you were assigned responsibilities much beyond your designated capacity? Countering the jitters isn't difficult - in fact, its the direction you give to these fears is what sets you apart from contemporaries who encounter the same.

Its a simple principle - 
1. Accept that you do not know/cannot do EVERYTHING
2. Be confident that whatever you know/whatever you can do ,  you know it/can do it to the best it can be known/done.

If  acquiescing to the first statement is seemingly an issue, then your attitude quotient needs a shot in the arm. If the second statement is something you aren't confident about then its time to learn/unlearn and thus pep up your aptitude quotient. 

Think about it. No... not later... because then, you would be exhibiting inertia, in thought, that is. 

What can be finished tomorrow has to be started today ; what can be accomplished later has to be initiated now.