My top top top tip is to remove the caliper and pump the piston almost all the way out first.
This leaves you with a caliper full of fluid so that when you attach the new hoses you can push the piston back in and it forces fluid along the hose and UP to the resevoir.
Works with both front AND rear brakes and means you have a firm lever straight away with no need for 2 hours of fruitless pumping on the lever followed by an email saying 'HELP!!'
If the fluid is dirty you can then change it in the usual way
I've got an inferiority complex But its not a very good one!
Undo the top/ uppermost one first
Then tip it into a suitable container
Then undo the other one
In any case it'll be a trickle not a gush (unless you're pressurising the system eg by leaning on the brake pedal! ) so a bit of rag underneath will be fine
I've got an inferiority complex But its not a very good one!