Actually, getting them off is the hard part....
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I swapped these on the driveway with hand tools. Spent most of the day and a lot of sweat removing the old ones. The new tyres went on by hand (well, foot actually) without the use of levers.
The comments about watching the road for debris is not as daft as it sounds. I got regular punctures when I first started commuting, at least one every 2-3 months and obviously with this being random sometimes only days apart. 1 type of puncture was small glass splinters and often occurred shortly after riding through a certain park at or just after weekend. I concluded that the local yoofs were probably smashing bottles at weekends and although the mess was always swept up when I passed through the finer glass splinters remained. Once I stopped riding through that park and detoured around instead those punctures pretty well disappeared.
The other common source was larger items like screws, metal fragments, even a Stanley knife blade once, often picked up around the mid point of the commute as I passed near to the areas large civic tip. I began actively looking out for any bits & pieces that were a threat in this area and also avoiding the bits of no-mans land around traffic islands and in the chevroned areas as these were a haven for the crap that must have been falling from the vans, trucks, cars and trailers that were all heading to the tip. Those punctures have also stopped.
It is now unusual if I have more than two commuting punctures in a year. I am running the exact same brand and model of tyres and still don't check them for embedded items but simply by looking where I ride and avoiding the worst areas has made a massive difference to the puncture rate.