Hi Hardknight and

to the Forum !
Removing the Fairings is NOT at all difficult !
Triumph did a great job of hiding all the securing bolts,
and as a part is removed, further bolts are revealed,
so everything has to be done ( more or less ) in a certain order.
I wrote a Topic a few years back showing step by step instructions on removing the Fairing
( and installing "R & G" Crash Bars ) with Photo's, and which also has a sheet you can download
listing the location of all the bolts for reference :
HOW TO : Remove the Fairing AND Fit R&G Adventure ( Crash ) BarsIt's one of several useful "HOW TO" guides in that Section of the Forum

With regards your Air Filter it depends on when the bike was last serviced / when it was last changed.
The service schedule calls for it to be changed every 10,000 miles.
There is a Service schedule in the Owners Handbook, although it contains some errors !

You can download a document from the Forum which has the known errors corrected in the Service Schedule,
along with corrections for the official Service Manual and other Triumph publications for the Trophy SE in the same place :
Servicing Data, Reference Info. & DTC ( Fault ) CodesCheers

