May be exist wallets for this task?
You can try entering your "private key" into https://www.bitaddress.org/ (NOTE: download, run "offline"... click on "Wallet Details" tab). It purports to accept - WIF (starts with "5"), WIFC (WIF Compressed, starts with "K" or "L"), HEX, B64 (Base64), B6 (Base6... ie. "dice"), MINI, BIP38 (BIP38 Encrypted)
It will display the WIF and WIF Compressed keys along with the matching bitcoin addresses, so you know which WIF key to use to import into the wallet of your choice.
Things will be slightly more complicated if your private key is in "xprv" format.