architraves

I have had my timber windows installed (Double brick wall) and I need to install architraves which I think I can do myself.
Are there any pit falls to look out for when doing this? I noticed the window frames are about 10-30mm smaller than the window/wall opening so this should be covered with the architrave anyway.
Should I use sealer when installing architraves??
Then on the outside of the window edge i will need timber beading. Again any tips, will i need to use sealer??
Thanks guys
Bart



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