yes one of them long funnels work great, and a flash light aimed at the hole so you can see how much fluid its up to, don't want to over fill it.
is it getting hard to turn to the left? harder than the to the right? that usually means the rack is on its way out. my pump was whining like mad,(no leak, still full) swapped it, and i still couldn't steer, so then i did a rack, now it turns like butter. mine was hard to turn left, much easier to the right.