Sounds like it's going well!
It's always a good idea to wait a few days to see how you react to changes in basal and ratios. I usually wait 3 days unless it's seeming to cause me hypo's or high highs!
I tend to aim to change one thing at a time if possible, this way if theres a problem i can predict it's the last thing i changed. For example i change my cannula and my BG seems to be rising with little effect from corrections i can assume it may be a bad infusion site.
But if i were to change my cannula, tubing, cartridge all at once i would have to work my way through them all if i had a problem.
It's also good if your starting out to be able to fully concentrate on just one thing too. Sometimes it'll fall that you may have to change your cartridge the same day as your cannula but it doesn't matter, it's something i prefer to do so don't worry too much.
I also note in my diary when i last changed things, helps me remember when to change each thing. I also have a reminder set on my meter that beeps at me to change my infusion set every two days.
I also test my BG and hour and 2 hours after changing my set, this way i can know that its working fine.
What type of cannula do you use? if you use a teflon cannula it's sometimes recommended you leave the old one in as well as your new one for a few hours so if theres a kinking problem you can plug back into your old cannula straight away. I use steel cannulas so it's not a problem for me.
Keep asking anything you like, theres been many a time when i was new to it i just searched for my problem and someone had posted previously about it, so it's always a good idea