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M4xime
BrickMan
Easy to change yourself if you own a rubber mallet, a pencil (mark the beads and orientation 1st), a big fat paint scraper or some kind of sharp flat edged tool, and probably a mate to help stop glass falling out at the critical moment.
Mark your beads, tops, left, right, bottom.
Strike the longest one out first, then the others. Hit in the middle towards centre of glass and then get the rest out with a tyre lever etc.
Get the unit out, mark on the frame number and location of any glazing packers.
Measure your unit.
Order.
Put it back in, then rinse and repeat when it turns up. Worth putting a pipe cleaner or a bent spoke through your drains in each unit too, make sure they all work, spiders do a good job of blocking them up.
Most places sell 'low e' glass now, which is great, efficiency innit, but if you are just changing one glazing unit in a frame, and not the other, it will be noticeable from the outside that you have some low e and some regular coated glazing.
Bit of fairy or silicon grease to help let the beads back in is worth having on hand.