What do you want the wardrobe to do? Obviously you want it to store your clothes and other items but make a list of roughly what you have.
How many suites, long dresses, foldables (t-shirts, trousers, jumpers), shoes, boxes, board games etc. Are you hoping that your new wardrobes will store more than your current solution? Make the list as detailed as you can. (It may seem like overkill, but if you do this you will end up with a much better solution in the end).
2. Sketch it.
Do a rough sketch of your room. It doesn't have to be architectural but make sure you include plug points, radiators, window sill heights and any other fixed items on the drawings. If there are lose bits of furniture that you are 100% certain you'll be keeping in the room, draw them in too.
Measure everything in cm rather than inches - its easier when selecting items online or in shops.
If you're feeling up to it, try using a free drawing program like Sketchup to get more accuracy - https://www.sketchup.com/
Don't automatically assume that you have to position the wardrobe where it has always been
3. There is no such thing as "we don't have a budget". Rather than setting a fixed figure like £3000, better to set a range. Be clear with yourself what your range is. What is it that you expect from your range? If you're looking for a large 4 metre wardrobe, with pull down hanging, hundreds of drawers, leather doors and disco lighting, will your range realistically cover it?
Make sure you set a realistic range before and during your online research.
4. Take lots of photos of the room where the wardrobes will be placed. Take a video too. Don't just take photos of the wall or corner where the wardrobe will go - be sure to get a complete 360 of the room. This will help the in-store designer advise you much better on colours, finishes and style
5. Save time by looking online before heading out - look at online customer reviews of the shops you are thinking of visiting - there are many shops that have fantastic reviews - aim to see those first. Avoid those shops that suppress or don't encourage customer reviews.
Obviously also avoid those that have poor reviews!
6. Check the floor to ceiling height in several places, not just one. If you think you need a 3 metre wardrobes, check the floor to ceiling once every metre along the run where you think you will place the wardrobe and make a note of all the measurements. Floor to ceiling height can vary from one end of a room to another and it's worth beginning your search with accurate information.
7. Plan your hunt - make a list of stores that you want to visit - speak to the store beforehand to understand their price points to ensure they are aligned with your budget range.
Find out if the store offers a variety of different brands or just one - the more brands they offer, the more variety you can expect in terms of style, door type, size flexibility, price and delivery time.
8. Understand the difference between a wall fitted wardrobe and a stand alone or freestanding fitted wardrobe. Wall fitted wardrobes are usually made from chipboard and have the advantage of being a cheap solution. Stand alone fitted wardrobes tend to be a little more expensive but usually wear better..
9. Make sure the store has a design team available to help you design your wardrobe. Take your photos, lists & room sketch with you to help the in-store designer. In store designers will be able to show you a number of suitable options and then draw them out for you including customising the internal configurations of drawers, shelves and hanging to suit your requirements (hence the need to draw up that long boring list).
10. If you can, ditch the kids. Send them off on a play date or drop them off to relatives, friends, babysitter, zoo - anything to give you a few free hours where you can focus.