Here is what helped me;
1.) My first year I knew absolutely nothing about Western hunting, I knew I wanted to hunt something but didnt know what. I was on a limited time schedule (I tacked the hunt on the end of a Yellowstone vacation) so I decided to go with an outfitter. I had 3 days and my wife was with me, so I did my research and found a great outfitter and booked a 3 day antelope hunt. This by far is some of the best money I spent, I learned more in 3 days about antelope and mule deer hunting than I learned in 3 years of Eastern whitetail hunting.
2.) Once I knew a little about Western hunting I started researching the public land options and figuring out the tag systems, this is a long process and if you just jumped right into it with high expectations you will likely be disappointed. 2 years later I went on my first DIY antelope hunt in a poor access area of WY, took me 2 days to even see a antelope on the public land. However, those 2 days were not a waste. I seen some awesome country and unintentionally scouted some great deer country and discovered the majority of hunters really do hunt within sight of the road (hint, hint). Ended up taking a 13" lope on public land, a memorable hunt for sure.
3.) BUY POINTS! It is never to early to plan, get your buddies to buy points too. Once they see how much fun you have they will want to go.
4.) When you do a DIY hunt, think of it as a outdoor trip with the added bonus of being able to hunt. If you go totally focused on killing something you will likely be saddened. I recently went on a DIY Black Hills, SD turkey hunt and loved every single minute of it. I only hunted a couple hours in the morning, and spent the rest of the day hiking and exploring. Ended up killing a immature bird, but even if I didnt I had a wonderful time with my wife and I have already started planning another trip with a buddy of mine.
5.) Purchase a good GPS and a top quality downloadable map. One of the best peices of equipment you will have. Plus purchase the BLM, National Forest, etc maps...a delorme gazetteer is good to have, dont trust to boundary lines and road system but I find it easy to look over a general area to find a starting point.
6.) I do not know anything about MT, but I am slowly starting to research it. So far I have discovered the eastern side is more private and the western side is more public, a obvious trend for other states as well. I also like that MT has a later mule deer season, main reason I want to hunt there.
Not many people are going to give you a specific "spot", but they will help if they can. Do research and ask specific questions, i.e. "does such and such road lead into this piece of BLM land or does it become private property"
Like others have said, the planning is part of the hunt. Acquiring gear, pouring over google maps, etc is all part of the hunt. You will feel much better about yourself if you do it this way (at least I do). Regardless make a great trip out of it, ignore the "big buck" hype as you will only disappoint yourself, and have fun.
Here is a link to my blog;
http://walkinghomeloughery.blogspot.com/
The last two post are about DIY turkey hunts, one in SD and the other in AL. I had a blast and truly matured as a hunter, I consider myself more of a naturalist now.
Good luck