I couldn't do my taxes myself any more without the tax software.
Somebody else has to sweat the 6 million words. I just have to answer questions. Even then, there are constant online updates of the software until almost the end of the tax season. Last year was a bitch because they hadn't finalized the laws in time.
Answer to your question: You try to remove the whole tumor. You don't just take a little piece of it out, or move the chunks around and close up the skull. I will grant that it might take more than one operation.