Is it okay to pull out adult molars with cavities on them at home?

Ouch! Why would you attempt that at home? Ouch! please obtain a dental evaluation. Try to save the tooth if possible. If the tooth does need to be extracted, it is important to make sure that it is done correctly and completely, without trauma to adjacent teeth or anatomy. I am also thinking that if that tooth can be extracted at home you may have other dental issues that require attention.
No! No don't do it. First of all, it will be extremely painful. The dentist can numb you up where you won't feel anything at all. Secondly, you need an x-ray to determine the anatomy of the roots to see if it can be pulled normally or will need to go to an oral surgeon. Thirdly, you don't have the proper tools to do it. Fourthly, the cavity may be able to be filled and save the tooth.