Find home in hardcore Minecraft with reduced debug information?

Маке а compass and a lodestone. Place the lodestone in your home. Use the compass on the lodestone. The compass will always point to that lodestone.

There is also a cheaper method if your home is close to the world spawn: A normal compass always points to world spawn. Mark a path from your home to the world spawn and then go exploring. With the compass you can always go back to world spawn and from there - to your home.

In early game (before you can build a compass) build towers with torches on them or draw arrows on the ground in torches, or in some contrasting block.

The only way I could think of (without cheating) is holding down F3+C to crash your game. This probably isn't ideal, but you can find you coordinates. Look for something like this in the crash report:

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at ?(?:?)

-- Affected level --
Details:
    All players: 1 total; [?['Player Name'/1713, l='ClientLevel', x=XPOS, y=YPOS, z=ZPOS]]

where "?" could be anything, depending on the version, "Player Name" is your username, XPOS is the X, YPOS the Y and ZPOS the Z.

This isn't very ideal, so there is a another method that could be considered cheating:

Pause the game, press "Open to LAN", allow cheats, and press "Start LAN World". Now type /gamerule reducedDebugInfo false and press Enter. "F3" should now contain coordinates.