You have to decide for yourself if you are competent enough to complete what is quite a simple job, you just have to be careful and gentle. 
I have had a spate of people contacting me for batteries having bought cheap copies from the internet. The copy batteries have either swelled or not actually fitted inside the collar case. 

Batteries draining quickly, your collar not delivering any electrical stimulation or fading away when on vibrate are all sure indicators that you need new batteries. 

You can prolong your battery life by not charging more than is necessary and not leaving on charge for longer than specified. 
 
I am happy to fit your batteries for you if you would like to post your Dogtra E-Collar to me. Here's a video on how to fit your own batteries. 

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