belgian triple candi sugar

im doing my first belgian triple and need to add candi sugar. my LHBS said to just add it at the beginning of my 60min boil with all my extract. I have been reading that adding it last 5-15 min is the way to go. Also i have LME and DME should i add both at beginning of boil or half later towards end.

You're fine either way for both the sugar and the extract.

When I used LME and DME, I added them just after I got the water to boil. Some people like to add them later because 1) with a lower gravity boil, you get more AA extraction from the hops and 2) they felt that they got less of an "extract-twang". I resolved my extract twang issue by going using only DME and by partial mashing everything.

When I use candy sugar, I add it in the last 10 minutes.

Add the sugar towards the end of the boil or after primary fermentation is complete.