To get you started, here is a check list of tools and equipment you may need to hang pictures securely, safely and successfully. 

-      Tape Measure 
-      Pencil and Rubber 
-      Spirit Level 
-      Hammer
-      Drill (if hanging heavy work that requires a wall plug and screw) 
-      Picture hooks and nails
-      Wall plugs and screws (if required) 
-      Cord or wire for hanging. 

Before you grab the hammer and start attempting to hang your picture, you need to make a few practical decisions, such as, where you want it hung and is the wall structure suitable. You also need to decide how much support you’ll need to hang your picture securely, whether single or multiple hooks etc. Once you’ve established the location and hanging equipment needed follow there are some basic steps to follow for hanging. Whether you are going for a relaxed or a traditional museum approach this is a great base point. All rooms are different and the museum approach may not be appropriate for your décor.

Step 1 – Measure 
Take a width measurement of the wall you are hanging your chosen picture on. 

Step 2 – Align with the centre of the wall
Find the centre point of the wall by halving the overall width and place a small pencil mark.  

Step 3 – Determine the Height
Most people hang pictures too high; you should not have to strain your neck to see them. There is a bit of a science to picture hanging. That said, this is where your subjective style comes in, whether following the museum approach or not. 

Relaxed approach 

If you're confident with your artistic abilities, use your eye to judge where to hang your painting. This will allow you to balance your furniture, doors and windows. Just makes sure it's at a comfortable eye level. If not follow the next step: 

Technical/Museum approach – a simple equation 

1)    Measure 145cm from the floor this is the ‘ideal’ middle point of your picture. 
2)    Measure your picture and half it, this is the centre point. This is A.
3)    Measure the tension depth from the top edge – pull the picture cord/wire to full tension as it will be when hanging. This is B. 
4)    Find the height by doing this simple equation – 145 + A – B = Height to position your nail. 

 Handy tips 

-      A lot of plastered walls, particularly in older properties can crumble when a nail is hammered in. To protect your surface from damage or marks place a small piece of masking tape over the point for hanging. This will help to protect the nail point from causing damage. 
-      If your frame is heavy or slightly rough on the reverse place some small sticky felt pads on the reverse bottom two corners just away from the edge. This will pad and protect from rubbing or movement works on the wall. 
-      Use a spirit level to double check how level your picture is by placing it on the top and then the bottom of the frame, adjust accordingly. 
-      5-7cm between frames is a great rule to apply. 

Hanging a Picture Wall or Cluster 

Follow the same three steps, measure, find the middle width and determine height, then add the following step:

Additional Step 1 – Line up the centre, making the centre of the cluster/picture wall sit along the 145cm centralised mark. 

 
Hanging Pictures on the Stairs

Dependant on your desired overall look, you can plan this intuitively or structured. If going down the structured route add the following step:

Additional Step 1 – measure 145cm from the floor, this should be the centre of your first picture. 
Additional Step 2 – measure 145cm from every second to third step to form a diagonal line. This line should be the centre of each picture and then use the size of your frames to position each picture at an equal distance to space out most effectively.

Hanging a Scattered Display 

Choose a piece as a central focal point. This will form the middle of your cluster. Then follow these steps:

Step 1 – Measure up your 145cm point to find the middle point of your central picture. 
Step 2 – Build your gallery from the middle out, making sure you balance your pictures as you go. Always ensuring the central line stays at 145cm. 

This process is very subjective to what you see as ‘balanced’ so go with what suits you and suits the pictures and artwork you love and are wanting to hang.