If I play Switcheroo from Hidden, do I still need to pay the power costs?

No, you do not need to pay the power cost when playing Switcheroo from Hidden.

According to the RiftJudge FAQ #6234 and Rule 421.3:

• Playing from Hidden: When you play a card from Hidden, you ignore the printed energy and power costs in the top-left corner of the card.
• Cost: You only pay the 1 power cost required to place the card into the Hidden state initially. When you later reveal and play it from Hidden, you play it for free (0 cost).

Summary of the sequence:

1. Hiding: You pay 1 power to place Switcheroo facedown at a battlefield.
2. Playing from Hidden: When you reveal it as a reaction, you play it without paying its printed energy or power costs.

Note: While you do not pay the card's printed power cost, remember that if you target an opponent's unit that has the Deflect keyword, you must still pay the mandatory Deflect cost (as per RiftJudge FAQ #8535).