Firstly Congratulations!
Quite right.
It has been said that your best student is the one that kills you!
General instructor advice
-Trial Lessons are great fun - you meet lots of different people from all types of backgrounds.
-PPL's - Two types...
1) Those who are starting from scratch and are usually a pleasure to teach - you just need patience and the ability to present things in the best way for the student.
2) Those who have "flown thousands of hours on microsoft flight simulator" and think they know it all - they are quite hard work because they already have misconceptions about flying which interferes with the teaching and learning process. - Its good training on how to be assertive.
And of course there are those, as 18greens rightly pointed out, who are experienced and think the aim of a revalidation is to argue every point and teach you something about flying - just humor these ones and look at the plain facts (are they safe to fly the aircraft or not..etc)
Apart from those instructing is possibly the best job in the world - you get paid to do something you love, you'll meet some wonderful people and work with some great students and most of all you'll have experiences which you'll never forget for the rest of your life.
Enjoy it - you earned it! :-)
All the best.