A careful approach is probably the best approach. When you are new to driving a motorhome, extra driver training can be well worth the time and expense to give you more confidence. Camping and caravan clubs, as well as HGV training centers, offer a variety of courses. Taking a course should not cost more than £200, which is less than the cost of even the smallest amount of collision damage.
All passengers must sit in a seat and wear seatbelts inside the motorhome. Motorhomes are a highly dangerous and illegal environment to walk around while in motion. In addition, children under a certain age and size must be buckled into industry-standard child seats or booster seats. In the majority of modern motorhomes, Isofix points are installed and you will be able to find out to which seats you should not attach a child seat.
Be aware that motorhome speed limits vary based on their size and weight, so you should know what you can and cannot do. Generally, a motorhome weighing less than 3050kg can go the same speed as a car on a single-lane road and 70mph on a dual-lane road. However, if a trailer is added, both of those speeds are reduced by 10mph. It is possible to drive 70mph on a motorway with a motorhome weighing over 3050kg and less than 12 metres in length. A single-carriageway road can only go 50mpg, and a dual carriageway or a motorway can only go 60mpg.
Last but not least, ensure that your motorhome is fully insured. Motorhomes tend to have large front glass areas, so adding extra windscreen covers makes sense.