i don't know how the exhaust is configured on the model you have, so this is general advice.
take it off, working from the back to the front - may need penetrating oil; may also need to cut things off if they're seized.
refit from the front to the back. use new gaskets (and mounts, if required). don't torque everything up until you've got the complete system on and have adjusted it for fit - basically, make sure it's not too close to anything it might bang against and doesn't otherwise look out of place. then tighten all of the fittings.
may need to take it all apart again to use sealant on any problem joints, or if it's knocking anywhere.
after a couple of days use, nip up all of the fixings, as they'll have slackened with the heat cycles.