Unless the car hasn't been maintained very well, I'd more than likely say they will come out relatively easy.
I did mine a few years ago, and while they "don't just slide out" easily, they're not the 'skin grazing, blood letting, bastard type' of job either. 
They allow you good access to get. 
I really don't remember what tool I used to get any of the more difficult ones out, so I dare say I just used my hands, and maybe a bit of chubby checker .. twist this way and that and they popped out.
Obviously you got THE copper washers for them too, yeah?
I had a slight smoke issue with mine not long after I got it. Of course first thing comes to mind was injectors, and 330K klms of completely unknown usage by previous owners, I thought replace them to be safe .. etc. 
Also while still keeping it as daily as a daily could be. I don't mind spares if needed for a future date or something like that too.
I found zero difference in either engine running manner, nor fuel consumption(other than standard variability).
Mine were similarly priced 50 or so years ago, I can't recall where I got them .. maybe paddocks maybe same product, came in a Bosch packaging, etc.
				
			 
			
		 
			
				
			
			
				Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
			
			
		 
	
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