Just got My 400 back on the road Saturday after manually replacing a tire for the first time myself (put a new City grip on the Rear, to replace a punctured item. $62-95 from Bike Bandit).........
I bought a "Mini tire changer" from HF ($42). Which worked well as far as breaking the bead, and getting the old tire off the rim, but proved worse than useless when trying to mount the new one.
Two tire levers I bought from Northern tool ($34) on the way home Friday made quick work of mounting it on the floor of my Garage Saturday Morning.
There are many helpful videos on this subject on You tube. showing various ways to break the bead, de-mount, and mount, with the minimum of tools... in retrospect, I didn't even need the HF rig (but now I've got it, I'll use it to de-mount).
I now have all the tools I need to swap a tire out quickly, and easily, and having done it once, I'm surprised I hadn't tried before!!
It was a lot less difficult than I expected.
I wanted to try it out for a bit first..............and so this weekend I'm going to have a go at putting in the dynabeads I purchased, to see how they work out!
Find your tire online, get some tire levers, rim protectors, and go for it!!
You'll save money, and frustration.