With experience neither are that difficult, but as previous poster mentioned the 97 should have a spring compressor. I have done them without a compressor but if you slip, there are many sharp edges that can cut and slice....and I have had that experience many times !!! With the TX you can compress the preload on the mainspring with one hand easily.. With the 97 you have to unthread the trigger block and when it lets go...you better be in control. With the TX just remove a bolt and very little pressure from the spring and your done. I prefered the better quality piston and guides in the TX, in most cases I never replaced the factory internals unless they were damaged, where as the earlier 77 and 97 models used drawn sheet metal pistons and guides and were not as precisely made. With that said, I have been retired from working on springers for about 7 years now so I cant say for sure if the newer 97/77 have better quality pistons and guides or not. The 97 sells for less money and might be better balanced where the MK3 TX has a tendency to be barrel heavy. I find the TX stock and pull length fit me like a glove where as the 97/77 stock is longer and not as comfortable with my cheek weld, I find it more difficult to get confortable, however this is a personal decision and you should check for stock fit from both before deciding !!! Most will agree the TX has a better quality finnish than the HW rifles, however the HW is still a good looking gun !! I would seriously recomend trying both on for size and handling before purchase. While the TX does cost more, if it fits better and is easier to work on, then the cost may well be worth it !!! If your looking at a strictly 12 fpe rifle the 97/77 will have a better shot cycle, but if your looking for a 15 fpe plus rifle then the TX would be my choice. My own TX fac power rifle is just about as smooth as my older 12 fpe version and will group about as well. The 12 fpe version is much easier to shoot offhand by far, but I dont do much of that anymore.