It isn't that bad to do it yourself.
Be prepared to spend the time to get it right.
Pay attention to what adjustments you make and in which order.
Some adjustments will modify the previous adjustment.
Get the small rubber 3M paddle for body putty. (about 2"x3"x3/16")
I use one as a go-no-go gauge when aligning panels.
It seems to work really well.
Plan to spend some serious time on making it dead on.