Yes, you can absolutely work your way up to this. No one (well, except maybe my housemate, but he's real special) is born with a palate that can handle a jillion Scoville units. I was moderately heat tolerant until I spent a couple of years in Bulgaria, where if you add too much black pepper your dinner guests will say, "hoo boy! You Americans sure do like it fiery!"
As previous reply says, start slow, work your way up. Dairy helps -- water does not -- and so do sugar, rice, and coconut. Keep in mind too that different chiles, while maybe having a similar Scoville rating, will still feel differently spicy. I can handle Asian-spicy more easily than I can handle Mexican-spicy sometimes. Who knows why. I haven't googled it. Also worth noting is that the same variety of chile will not be the same level of spicy throughout the year. When working with jalapenos, I will cut off the top and put the cut side to my tongue to gauge the level of heat. Sometimes it's a kick in the pants, sometimes it's nothing at all. And of course, the capsaicin is in the ribs, so you can always cut out as much of that as you need to vary. Or you could leave out fresh chiles entirely and just go by hot sauce. That's a great way to standardize.
One more thing you may find helpful is to just chuck the whole chile in the pot, uncut. This technique is followed not infrequently with Scotch bonnet peppers when you want the flavor but not necessarily the searing pain.
Building spice tolerance involves some suffering, no way around it. Find things that hit your limit, eat them, then find things that are just barely past your limit, and eat a couple of bites. Then go back to the thing that just hits your limit, and eat more of it.