It's easy.
Read the instructions.
Make sure the etching templates are fixed properly with no bubbles. Be economical with the glass/panel chemicals (just enough to fill the holes) and only leave them on for the duration instructed. These numbers are meant to be a deterrent so do not hide them in inconspicuous places. I put them on all the big panels, engine covers, mirrors, screen and light lenses
Fitting the transponders is often easier if you remove a panel as you may find a convenient hole in the frame where wires & tubes pass through. You may prefer to raise the tank and stick one underneath rather than faff about getting it to stick inside.
Keep the 2 for the wheels handy and take them with you next time you get tyres fitted.