Presenting shlonkin's excellent design as a workshop
Start with a piece of perf board 8 holes wide by 11 holes tall. We used used Plated through holes for prototyping, but this layout will work with PTH or single layer boards. Be careful cutting and/or sanding the board - fiberglass dust is nasty stuff. To minimize dust, We suggest using a pair of tin snips to cut the board, or the tried and true "score with a knew and snap" method.
Solder in an 8 pin socket for your ATtiny85. Leave two holes free below the socket and two on each side.
Solder in the 0.1uf bypass cap just above the upper right pin of the ATtiny.
Bend the leg of the capacitor down and solder it to pin 8 (VCC) of the ATtiny. The other capacitor leg can be soldered in straight.