You can’t “do it yourself” when it comes to earning Heaven. Only what Jesus did suffices to earn your entrance. He lived perfectly according to the law. After he passed sinless on the earth, He took our punishment upon Himself. If you have received Jesus, believing in Him, you possess salvation.
Many have tried to earn salvation. Some whip themselves. Some make huge charitable donations. Others become suicide bombers. It’s all pointless.
It’s good to do good things and bad to do bad things, but all are irrelevant is you are trying to “do it yourself,” to impress God enough that He lets you in. We are saved by grace, not by works.