Following these guidelines should help to minimise problems, it will also make later editing easier on the whole.
- Keep 2D sketches simple - they'll be easier to understand, and easier to edit (when necessary).
- Sketch constraints are typically more efficient than adding dimensions - less clicks, less clutter.
- Your sketches should always be actual size, i.e. 1:1 (scaling for 2D drawings is handled elsewhere).
- Though you can mirror and pattern in a 2D sketch - that adds complexity (see item 1). Fillets and chamfers are also available within sketches. However, it is recommended to carry out these operations as 3D features rather than in sketches.
- You can import 2D DXF or DWG features into 2D sketches - however, these imports often need 'cleaning up' - creating your own sketch from scratch is often more reliable.