This may be commons sense, but if you are able to use DME on any approach whether it is an on-field or off-field navaid, convert your VDP into DME. Then you simply wait for the DME that you calculated to arrive. After that point, its missed approach time or circle-to-land time.
If there is no DME to use on the approach then 10% of your MDH gives you the time to go to MAP. In other words, if you have an MDH of 500 ft AGL, then 50 seconds prior to the MAP is your VDP. Always try to use the count-down method.
Good Luck!