I use one of these: Wolfcraft 4522 Tec Mobil Drill Stand/Guide
It's very handy and lets you drill in a controlled way even in awkward
situations. It's not a subsitute for a DP, but there again, a DP isn't a
subsitute for one of these things.
There are plenty of similar offerings from other manufactures and Wolfcraft
themselves offer a range.
Take a piece of 2 inch thick maple and drill a hole in it. Then you drill
through it in to your work. Another option for a lot of holes is to buy a
drill bushing and insert that in to the maple. It lasts longer.
I have had a simple commercial jig for years to do that with. It consists of a
flat circular ring OD of 6", ID of 4.5" and two vertical rods bolted to the
base. The drill itself chucks to a carrier that rides on the rods and has it
own center shaft and chuck. Even has a vee-block built in.