Luckily I was at Red Rocket, that's always my spot to unload junk and tinker with my stuff.
when you finish them, just dont talk to preston and the quest will stay there but will be considered completed when it times out instead of failing. gives you a lot of extra time and its not like you have to tell preston everything you do..
you also will not get more than three at a time so if you just sit on them you will not get anymore untill they time out.. it takes a while for them to time out.
Do not be pressured...... period.
Do whatever if-and-when-you-get-around-to-doing-it .
I always accept all quests and let them pile up..... and choose one to do later.
It's a charistic of these games to try and rush the player...... relax, it will all be there later.
That punk always tell us what to do when we just want to invite him for a walk.
LOL