We can't help you any more than saying "get it done!"... especially if you have only managed 2 of your list properly.
With SM64 you can complete it by playing for 30 mins or so a time... you could get 1 or 2 stars then save, if you get stuck on a level, move onto the next one when you can.
OoT and WW require longer sessions really, perhaps if you have 2-3 hours free at the weekend you could do 1 dungeon and the bit leading to the next dungeon... as soon as you get bow+arrow... find one of the huge hurricanes and defeat the wind god at the top (3 arrow hits required... it can be tough to hit him though) Also make sure to find tingle on Windfall Isle, he will give you a map showing you his island as well as 2 fairy locations to get a bigger wallet... when the triforce collection quest starts this will help.
