Perhaps this video would help you,
How to bruite force bitcoin wallet. As far as I know that person have good knowledge about it, but it is only learning purpose, I haven't tried it myself. You may learn from video and get details from mentioned by @math09183.
By the way, even you hadn't save your seed? Or private keys from your wallet? Remember, don't forgot to backup your wallet file and don't share it with any third party. Perhaps some scammers would send PM to you for recover your funds. If its happen just share with us so we can see if the person is trusted. Don't lose your fund with scammers. Be careful and try yourself only and download any kind of script from trusted source only.