A technique or method is a process which an agent can use to create a specific action, or to creatively pursue a specific goal.
Technical is a trait of any element, such as process or problem, which is (1) inherent to or (2) highly predictable within a specific context, due to non-personal and non-social factors.
Methodical is a trait of activities which consistently use a specific method in clearly definable conditions.
A technique is the type of tool which facilitates the use of other tools; therefore, it's acceptable for the term "tools" to mean "tools and techniques".
Specific techniques often require external (non-bodily) tools, ingredients and/or skills.
Agents can confidently perform non-problematic technical processes if they consistently adhere to all rules and guidelines. Likewise, agents can confidently believe that a technique will fail if a crucial technical problem is present.
Technical processes and problems can be inherent to designed systems. They can also seem to be inherent to emergent systems, but this is often subject to rapid and unpredictable change. For example, a technically reliable process can become unreliable if the context changes, and a technically impossible problem can become possible if the context changes. For example, if it seems technically impossible for a person to get to work on time, it can become possible (and successful) if a benefactor loans them a working vehicle. (More examples will help here.)
Note that a problem is not primarily technical if it's based on an agent violating accessible rules.