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most awkward bit is remembering where all the packers go.
Don't just follow what's there!
I often find the packers are placed incorrectly or they are missing.
Also, is the new piece exactly the same size as the original.
The packers need to support the glass, but they also need to support a side opening window /door. Don't put a packer under the handle side.Packer placement-
https://images.app.goo.gl/hWQbBSWQMpZwRq8H8
Nah don't worry about it it's dead easy, most awkward bit is remembering where all the packers go. Watch this
maybe to help with confidence