Even with several years of updating various models of Garmin sat-navs, I have found the experience torturous at times.
You buy a micro/SD card preloaded with the Ireland/UK maps, you insert it into the side of your device and off you go.
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Firstly, the price is much cheaper than on the Garmin website, and very similar to only getting an individual update so well worth doing.
The problem is the very slow download speed, I left mine downloading all night, select download to the computer and not to the unit itself as this is problematic, and the maps were there in the morning.
People don't seem to understand that the new maps are getting bigger so they do not all fit on the unit, but you can still get 90 percent of it onto the unit and expand the units capacity with an SD card, I don't see the problem with this and I think that people are unfairly blasting Garmin over this.
Anyway, do not delete the base map( gmapbmap file), only the big map file.
The next problem is getting the maps onto the unit, I had problems with the Map Install program, so I used the Map Source program which is much better, try to get these programs before downloading.