No not at all, to do it I normally use a degree disc to find the centre point of rock of the cam and the crank, using a dial gauge/degree disc/pointer then go from there.
There is a cheat way on some engines if you just time as std then lock things in position then fit vernier(adjustment) loose, tension belt then tighten vernier adjustment up.
This will put it in the std position, unless you have certain mods a vernier is unlikely to achieve anything.
It's quite easy, just take your time, do it once do it right.