Spending is easy. Just use the sweep option of a mobile wallet. In Mycelium wallet, tap the 3 little dots in the upper right corner and choose "Cold Storage".
This will allow you to transfer all the coins to your wallet app. If you don't want to spend all your coins immediately, you can transfer the remainder to another paper wallet.
This is why I prefer to keep my coins in many wallets. You can sweep a wallet with only as many coins as you want to spend or feel comfortable carrying in your phone.
with the mycelium mobile app you can also sweep from paper wallet directly to another wallet, not just into mycelium. for example i swept a paper wallet directly to my trezor with it when i was splitting bcash out from it.