SketchUp modeling can be made much smoother if you tune the interface and make a custom template. 

Tune SketchUp How to start SketchUp Make and customize the interface.

Once installed, a shortcut to SketchUp Make can be found on the desktop. Double click and the opening screen shows. Note that the publishers of SketchUp encourage you to buy the Pro version.

Make

Select the 'Start using SketchUp' button at bottom right. The SketchUp modeling environment will show. Your screen should be similar (but not identical) to that shown below.

Step 1: 

Use Window > Default Tray to set up a panel (Window) on the right with options as shown below. We recommend showing Entity Information, Components and Layers.

Interface

Step 2:

Just like gCADPlus, a proper SketchUp model should be full size and units set appropriately.

Use Window > Model Info and set units to decimal feet or mm depending on the environment in which you work.

Remove the tick mark 'Enable length snapping'.

Step 3: Make new layer

In the Layer window to the right of screen, click on the + sign and make a new layer ready for any gCADPlus image files we want to load in SketchUp.

Step 4: Adjust views

Camera to parallel, view to top.

Step 5: Save template

Save a copy of this file to the Templates folder using File SaveAs template and set to use each time SketchUp starts.

Template

Tip: It is not possible (in this 2017 version of SketchUp) to browse to a template location.

If you want to check on your template Select Window > Preferences (Microsoft Windows) or SketchUp > Preferences (Mac OS X). In the sidebar on the left, select the Template option. Your new template should be at the top of the list.

Tip: Keep a copy of your template in a separate location. If you want to add to it, open and save template, overwriting the existing one.

Tip: It is a good idea to keep adding to your template such things as low polygon species models, components such as doors and windows that automatically cut openings, materials etc.

Configure Sketchup