I’m sure you will have a great time.
Here’s some random thoughts.
Try to load a week’s provisions onto the boat before you start off, especially heavy and bulky items as there will not be many places to stop and stock up. Carrying stuff back to the boat on foot can literally be a pain in the neck. Here’s a list for starters beer, wine, milk, bottled water (if you use it), potatoes, fruit, toilet rolls.
Ellesmere is the easiest place to stock up mid-trip. You can go up the canal arm and try to find a mooring. The town, and Tesco supermarket are at the end of the canal arm. There is a good delicatessen in the town Vermeulen & son.
Make sure you can make a couple of evening meals, just in case you decide to moor overnight in the countryside or you find that you are running late and can’t get to a pub in time.
You may like actually cruising along the canal and decide to go further than your original plan. If you decide to get back to the boatyard a day to two early and explore the other end of the canal then as the boat is longer than the canal is wide, make sure you know where to turn the boat when you decide to head back to base. Turning points or winding holes are marked on the canal guides but are not always easy to spot. I’ve met a few hire boats that have missed their turning point and have had to continue to the next point. This added a few hours to their journey and really threw their plans into disarray.
Early morning and late evening can be the best times of day to cruise.
Do start off early at least one morning when the mist is still on the canal.
It’s best to fill the water tank every day. Water points are marked on the canal guides. It can take an hour a day to queue and fill the tank, especially if you like your showers.
When you take over the boat, loading the boat takes time.
Space on the boat will be at a premium. For your luggage, either try to use soft bags that can fold and stow, or if you have a car, empty your bags and suitcases and leave the empty suitcases in the car.
If you moor in Llangollen there is a ruined castle on a hill that is a pleasant walk and gives good views,
Castell Dinas Bran http://www.castlewales.com/dinas.html
In Llangollen, I’ve had some nice food at the Corn Mill. This is just over the bridge, overlooking the river. http://www.brunningandprice.co.uk/cornmill/